diff --git a/.claude/skills/class-object-engineering/SKILL.md b/.claude/skills/class-object-engineering/SKILL.md
index 53826cd..98b44ff 100644
--- a/.claude/skills/class-object-engineering/SKILL.md
+++ b/.claude/skills/class-object-engineering/SKILL.md
@@ -1,20 +1,38 @@
 ---
 name: class-object-engineering
 description: >-
-  CI Server R1.03 PROCESS Service classes, objects and trigger groups. Use when the user wants
-  to create a trigger group, write or compile a class (traditional language), create objects
-  from a class, or load classes and objects with quick load files. Sources IM 36K10G10-01EN
-  (Tutorial) and IM 36K10J10-01EN; to be extended with IM 36K10L10, P10 and P11 in phase 6.
+  CI Server R1.03 PROCESS Service: trigger groups, classes and objects. Use when the user wants
+  to create a trigger group, write, compile or change a class (Traditional PROCESS language or
+  Java), use signals, attributes, prompts, timers or template items in a class, create objects
+  from a class (with prompt answers), let an object create its own items, reset a class after a
+  change, read or change object attribute values, see which item a signal uses, load or remove
+  classes and objects with quick load files, or check PROCESS Service with opcdbg (database
+  check, object status, executor statistics). Sources IM 36K10L10-01EN, IM 36K10P10-01EN,
+  IM 36K10P11-01EN, IM 36K10G10-01EN (Tutorial).
 ---
 
 # Class and object engineering (R1.03)
 
-Background: `knowledge/manuals/IM36K10G10-01EN.md` (chapter 5) and
-`knowledge/manuals/IM36K10J10-01EN.md` (sections 2.4 and 5.3). Known issues for PROCESS
-Service: `knowledge/manuals/IM36K01A50-01EN.md`.
+Background: `knowledge/manuals/IM36K10L10-01EN.md` (processes, `opc.sup`, `opcdbg`, data
+store), `IM36K10P10-01EN.md` (Traditional language), `IM36K10P11-01EN.md` (Java),
+`IM36K10G10-01EN.md` chapter 5 (Tutorial). Known issues for PROCESS Service:
+`knowledge/manuals/IM36K01A50-01EN.md` (PROCESS 1.10).
 
-Rules: run `system-check` first; creating classes and objects changes the running system.
+Rules:
+- Run `system-check` first; follow the user's chosen way of working.
+- Creating, changing or resetting classes and objects changes the running system; objects can
+  write to items (and through them to devices). Test on a test system or with the user's
+  approval.
+- Deleting an object deletes the items it created (and their history links).
+- `opcdbg`: read-only actions only, unless the user approves (task `opcdbg-checks.md`).
 
 | Task | File | Status |
 |---|---|---|
-| Trigger group, class (compiled on load) and object via quick load | `tasks/load-class-object.md` | verified |
+| Trigger group, class (compiled on load) and object via quick load; compile errors; remove | `tasks/load-class-object.md` | verified |
+| Traditional class with prompts/attributes, signals from the object's section, items created from a template, input check; change an attribute at runtime | `tasks/traditional-class.md` | verified |
+| Java class: attach and create items, signal trigger, system log message | `tasks/java-class.md` | verified |
+| Change a class that has objects: compile, reset with `opcdbg` | `tasks/change-reset-class.md` | verified (`dssqld` reset does not work, ISS-028) |
+| `opcdbg` checks: database check, class/object details, object status, executor statistics, dumps | `tasks/opcdbg-checks.md` | verified |
+| Language reference (statements, operators, built-ins, DSS routines; Java API) | P10 / P11 summaries | from docs, main parts verified |
+| `opc.sup` settings (executors, priorities, statistics, PRINT) | L10 summary §2 | read-only check; changing not practiced |
+| Containment, inheritance, timers, alarms, STEP state machines, DSS routines | P10 / P11 summaries | from docs |
diff --git a/.claude/skills/class-object-engineering/tasks/change-reset-class.md b/.claude/skills/class-object-engineering/tasks/change-reset-class.md
new file mode 100644
index 0000000..a9fbfc5
--- /dev/null
+++ b/.claude/skills/class-object-engineering/tasks/change-reset-class.md
@@ -0,0 +1,64 @@
+---
+task: Change a class that already has objects (compile and reset)
+version: R1.03
+source: IM 36K10L10-01EN §4 (Reset class); IM 36K10P11-01EN §2.3, §10.4; practiced with CI-Eng-Sample class CIENG_TANK 2026-09-30
+status: verified
+---
+
+# Change a class that has objects
+
+Objects keep running the **old** compiled code until their class is reset (verified). A reset
+restarts every object of the class; by the manual, `ONCE` trigger groups fire again. Items the
+objects created were kept, with their values (verified).
+
+## 1. New source and compile
+
+`dssqld -m` with the class name, `COMPILE` 1 and the new `METHOD`:
+
+```
+@FIELDS
+NAME,COMPILE,METHOD
+
+@CLASS_DF
+"CIENG_TANK",1,@"
+CLASS CIENG_TANK;
+  …
+ENDCLASS CIENG_TANK;
+"@
+```
+
+`Errors` 0 = compiled. On a compile error the old code stays; see `load-class-object.md` for
+reading the error listing.
+
+Export the class (`load-class-object.md` §2): after the compile `RESET_REQUIRED` = 1 and
+`OBJECTS_RESET` = 0 of `OBJECTS` n. Verified: the object still printed the old text.
+
+## 2. Reset the class
+
+**Works** — `opcdbg`, Classes, action 8 *Reset class*: class name, node (0 = this node), file
+for a reset report (empty = none; this prompt is not in the manual):
+
+```
+printf '2\n8\n<CLASS>\n0\n\n-1\n-1\n' | timeout 30 opcdbg 0
+```
+(Bash. Interactively, type the same answers.) Keep the time-out: `opcdbg` repeats its last
+prompt forever when the input runs out.
+
+Afterwards `RESET_REQUIRED` = 0 and the object used the new code at once (verified).
+
+The Engineering Module also resets classes (class properties); not practiced.
+
+**Does not work** (verified 2026-09-30, ISS-028):
+- `dssqld -m` with `NAME,RESET` = `"<class>",1` (also with `RESET_NODE` = the host node name):
+  accepted with 0 errors but nothing happens.
+- `dssqld -m` on `OBJECT_DF` with `RESET` 1: refused with `OPC-E-OBJ_RSTREQ, The class needs to
+  be reset first`.
+- `CLASS_RESET_COMMAND` (system-wide reset used by the Engineering Module) was not tried.
+
+## 3. Changing prompts or signals
+
+Only a change in the method bodies was practiced. When the class **prolog** changes (new
+signals, prompts, attributes, created items), check `EXTENDED_RESET_REQUIRED` in `CLASS_DF`
+after compiling; what an extended reset does was not tested. The safe way is to recreate the
+objects (remove, load) — note that removing an object deletes the items it created, with their
+history links.
diff --git a/.claude/skills/class-object-engineering/tasks/java-class.md b/.claude/skills/class-object-engineering/tasks/java-class.md
new file mode 100644
index 0000000..a6e533f
--- /dev/null
+++ b/.claude/skills/class-object-engineering/tasks/java-class.md
@@ -0,0 +1,87 @@
+---
+task: Write and load a Java PROCESS Service class
+version: R1.03
+source: IM 36K10P11-01EN §1–§5, §10; IM 36K10L10-01EN §1; practiced with CI-Eng-Sample class CIENG_JFLOW 2026-09-30
+status: verified
+---
+
+# Java class
+
+Worked example: class `CIENG_JFLOW`, object `CI-Eng-Sample.TANK1.JFLOW`
+(`examples/CI-Eng-Sample/06_class_df.qli`, `07_object_df.qli`). Language reference:
+`knowledge/manuals/IM36K10P11-01EN.md`. Loading and removing: `load-class-object.md`.
+
+Choose Java when you need loops, arrays of signals, inheritance, libraries, or signals that may
+stay unattached; otherwise the Traditional language is simpler.
+
+## 1. Class record
+
+Same as a Traditional class but `PF_LANGUAGE` = `"Java"` (cannot be changed later) and Java
+source in `METHOD`. The Java class name must equal the `CLASS_DF` name exactly.
+
+```
+@FIELDS
+NAME,DESCRIPTION,PF_LANGUAGE,TRIGGER_1,COMPILE,LISTING_WANTED,METHOD
+
+@CLASS_DF
+"CIENG_JFLOW","Inflow per minute (Java)","Java","",1,0,@"
+import fasttools.processfast.*;
+
+public class CIENG_JFLOW extends ProcessClass {
+
+    Signal sInflow = defineDoubleSignal(Signal.Trigger.VALUE);
+    Signal sPerMin = defineDoubleSignal();
+
+    public void create() {
+        attachItemToSignal(sInflow, getSectionsPath() + ".INFLOW");
+        createItemForSignal(sPerMin, "CI-Eng-Sample.TEMPLATES.TPL_REAL",
+            "DESCRIPTION", "Tank inflow (m3/min), class CIENG_JFLOW");
+    }
+
+    public void signalEvent(Signal signal) {
+        double mInflow = sInflow.getValueAsDouble();
+        sPerMin.setValue(mInflow / 60.0);
+        systemMessage("CIENG_JFLOW " + getTag() + ": inflow " + mInflow);
+    }
+}
+"@
+```
+
+`OPCMAN` starts the Java compiler `OPCJCOM` on demand; allow ~15 s, then export the class and
+check `VALID_METHOD` = 1 (as in `load-class-object.md`).
+
+## 2. Object
+
+```
+@FIELDS
+NAME,DESCRIPTION,CLASS
+
+@OBJECT_DF
+"CI-Eng-Sample.TANK1.JFLOW","Tank 1 inflow per minute (Java)","CIENG_JFLOW"
+```
+
+Prompts: `Attribute aX = defineStringAttributeForPrompt("…");` → answer in `ATTR_VALUE_n`;
+refuse bad answers with `cancel("text")` in `create()`.
+
+## 3. Results on the test system
+
+- Signals: `sInflow` → `CI-Eng-Sample.TANK1.INFLOW`; `sPerMin` → created item
+  **`CI-Eng-Sample.TANK1.JFLOW.sPerMin`** — automatic names keep the identifier's case, and
+  `itmval` needs that exact case (`…SPERMIN` is not found). Give a `"NAME"` if you want
+  upper-case item names.
+- `INFLOW` 120 → `sPerMin` 2; 90 → 1.5.
+- `systemMessage()` appears in `umhlog.log` from `OPCJEXE` as
+  `UMH-I-INFO, (<object>: <text>)`.
+- The first object ran without resetting the new class, although the manual asks for a reset
+  (ISS-029). After changing a Java class that has objects, compile **and reset** it
+  (`change-reset-class.md`).
+- Deleting the object deleted `…JFLOW.sPerMin` and section `…TANK1.JFLOW`; `INFLOW` stayed.
+
+## 4. Pitfalls (manual)
+
+- Definitions (`define…()`) only at class level, without `public`/`private`.
+- `create()`/`destroy()` run in a different process than the trigger methods: only attributes
+  keep values between them; no timers or signal values in `create()`.
+- Never sleep or loop long in a trigger method: it blocks all objects of the same priority.
+- No anonymous listener classes (fail at object start with `NoClassDefFoundError`).
+- Dataset access: get the session with `getDssSession()` and never close it (release notes).
diff --git a/.claude/skills/class-object-engineering/tasks/load-class-object.md b/.claude/skills/class-object-engineering/tasks/load-class-object.md
index 9aca5ba..7ab7527 100644
--- a/.claude/skills/class-object-engineering/tasks/load-class-object.md
+++ b/.claude/skills/class-object-engineering/tasks/load-class-object.md
@@ -1,16 +1,18 @@
 ---
-task: Create a trigger group, class and object with quick load files
+task: Create trigger groups, classes and objects with quick load files
 version: R1.03
-source: IM 36K10G10-01EN §5.1–5.3; IM 36K10J10-01EN §5.6; practiced with CI-Eng-Sample 2026-09-30
+source: IM 36K10G10-01EN §5.1–5.3; IM 36K10L10-01EN §3; IM 36K10J10-01EN §5.6; practiced with CI-Eng-Sample 2026-09-30 (full remove/reload with three classes and objects)
 status: verified
 ---
 
-# Trigger group, class and object via quick load
+# Trigger groups, classes and objects via quick load
 
-Load in this order (each with `dssqld -i <file>.qli -l <file>.qlo`, check `Errors` = 0);
-remove in reverse (object, class, trigger group) with `NAME`-only files and `dssqld -r`.
+Load in this order, each with `dssqld -i <file>.qli -l <file>.qlo` and check `Errors` = 0:
+items the classes need (template items, attached items) → trigger groups → classes → objects.
+Remove in reverse (objects, classes, trigger groups) with `NAME`-only files and `dssqld -r`.
+Run `dssqld` from the folder that holds the files and use short relative names (ISS-020).
 
-**1. Trigger group** (`TRIGGER_DF`, name max 16 characters):
+## 1. Trigger group (`TRIGGER_DF`, name max 16 characters)
 
 ```
 @FIELDS
@@ -20,17 +22,23 @@ NAME,DESCRIPTION,TRIGGER_INTERVAL
 "CIENG_1S","CI-Eng-Sample one second trigger","1 seconds"
 ```
 
-**2. Class** (`CLASS_DF`, name max 16 characters). The source goes in the `METHOD` memo field,
-between `@"` and `"@` on their own lines; `COMPILE` 1 compiles it on load; `TRIGGER_1`
-attaches a trigger group:
+Other fields: `ACTIVATION_TIME`, `DEACTIVATION_TIME`, `TRIGGER_ONCE` (1 = run once when an
+object is activated), `CORRECT_DAYLIGHT`. A class or object without a trigger group only runs
+on signal triggers, timers and `TRIGGER` statements.
+
+## 2. Class (`CLASS_DF`, name max 16 characters; the language allows 15)
+
+The source goes in the `METHOD` memo field between `@"` and `"@` on their own lines.
+`COMPILE` 1 compiles it on load; `PF_LANGUAGE` is `Traditional` (default) or `Java` and cannot
+be changed later; `TRIGGER_1`…`TRIGGER_8` attach trigger groups; `PRIORITY` 0–999 picks the
+executor (installed: `OPCEXE1` 0–249 … `OPCEXE4` 750–999).
 
 ```
 @FIELDS
 NAME,DESCRIPTION,PF_LANGUAGE,TRIGGER_1,COMPILE,LISTING_WANTED,METHOD
 
 @CLASS_DF
-"CIENG_INCR","Count CI-Eng-Sample.DEMO.COUNTER 1..100","Traditional","CIENG_1S",1,1,\
-@"
+"CIENG_INCR","Count CI-Eng-Sample.DEMO.COUNTER 1..100","Traditional","CIENG_1S",1,1,@"
 CLASS CIENG_INCR;
   PROLOG
     SIGNAL INPUT := "CI-Eng-Sample.DEMO.COUNTER";
@@ -46,23 +54,70 @@ ENDCLASS CIENG_INCR;
 "@
 ```
 
-The item a `SIGNAL` names must exist first (or be created by the class with `FROM … MAKE`).
+Several classes (also mixed languages) can share one file and one `@FIELDS` line; leave unused
+fields as `""`. See `examples/CI-Eng-Sample/06_class_df.qli`.
 
-**3. Object** (`OBJECT_DF`): full name in its section, and the class:
+**Check the compile**: export the class with a filter file and read the flags after the source:
+`VALID_METHOD` = 1 means compiled; `ATTR_PROMPT_n` shows the class's prompts;
+`RESET_REQUIRED`, `OBJECTS`, `OBJECTS_RESET` matter when changing a class (`change-reset-class.md`).
+
+```
+@SELECT
+'NAME = "CIENG_TANK"'
+@CLASS_DF
+```
+`dssqld -e cls.qli filter.qli -l cls.lst`
+
+**Compile errors** (verified, Traditional): with `COMPILE` 1 on insert, a class that does not
+compile is **not inserted at all** — the `.qlo` only says `DSI-E-OPCCOMERR, Compilation failed
+with n error(s)`. To see the errors, insert the class with `COMPILE` 0, then update it with
+`dssqld -m` and `NAME,COMPILE,LISTING_WANTED` = `"<class>",1,1`: the update fails the same way
+but the class's `LISTING` field (export as above) now shows the numbered source with
+`**** ERROR: …` after the faulty line. Fix the `METHOD` field and compile again.
+Class language: `traditional-class.md` and `java-class.md`.
+
+## 3. Object (`OBJECT_DF`)
+
+Full name (its section must exist), class, and `ATTR_VALUE_n` = answer to the class's n-th
+prompt:
 
 ```
 @FIELDS
-NAME,DESCRIPTION,CLASS
+NAME,DESCRIPTION,CLASS,ATTR_VALUE_1
 
 @OBJECT_DF
-"CI-Eng-Sample.DEMO.INCR1","Counts DEMO.COUNTER every second","CIENG_INCR"
+"CI-Eng-Sample.DEMO.INCR1","Counts DEMO.COUNTER every second","CIENG_INCR",""
+"CI-Eng-Sample.TANK1.CALC","Tank 1 volume (capacity 200 m3)","CIENG_TANK","200"
 ```
 
+Other fields: `TRIGGER_1`…`8` (object's own trigger groups), `PRIORITY`, `CONTROL_ITEM`
+(item whose status blocks/stops the object and whose value is `STEP`), `ITEMS_MAY_EXIST`
+(allow linking to items that already exist instead of creating them), `LEAVE_ITEMS` (keep
+created items when the object is deleted), `DEBUG`.
+
+The item a plain `SIGNAL` names must exist. If the class refuses the object (`ERROR` in the
+prolog, Java `cancel()`, missing item) the row counts as an error and the `.qlo` shows the
+reason (e.g. `OPC-E-INFO, <text>`); nothing is left behind.
+
 ## Check
 
-Run `itmval -g -n CI-Eng-Sample.DEMO.COUNTER` a few seconds apart: the value rises by one per
-second. To inspect a class, export it with a filter file (`@SELECT`, then
-`'NAME = "<class>"'`, then `@CLASS_DF`).
+- Items the object writes: `itmval -g -n <item>` a few seconds apart (sample: `DEMO.COUNTER`
+  rises by one per second).
+- Which item each signal got: export `OBJECT_SIGNAL_DF` with filter
+  `'OBJECT = "<object>"'`; attribute values: `OBJECT_ATTR_VAL` (same filter).
+- Run state: `opcdbg` (task `opcdbg-checks.md`).
 
-Example files: `examples/CI-Eng-Sample/05_trigger_df.qli`, `06_class_df.qli`, `07_object_df.qli`,
-`86_` to `88_remove_*.qli`.
+## Remove
+
+```
+@FIELDS
+NAME
+
+@OBJECT_DF
+"CI-Eng-Sample.TANK1.CALC"
+```
+Then `CLASS_DF`, then `TRIGGER_DF`. Deleting an object also deletes the items and sections it
+created (verified); items it only attached stay.
+
+Example files: `examples/CI-Eng-Sample/05_trigger_df.qli`, `06_class_df.qli`,
+`07_object_df.qli`, `86_` to `88_remove_*.qli`.
diff --git a/.claude/skills/class-object-engineering/tasks/opcdbg-checks.md b/.claude/skills/class-object-engineering/tasks/opcdbg-checks.md
new file mode 100644
index 0000000..00ffa84
--- /dev/null
+++ b/.claude/skills/class-object-engineering/tasks/opcdbg-checks.md
@@ -0,0 +1,47 @@
+---
+task: Check PROCESS Service with opcdbg (database check, classes, objects, performance)
+version: R1.03
+source: IM 36K10L10-01EN §4; practiced on the test system with CI-Eng-Sample 2026-09-30
+status: verified (read-only actions and Reset class)
+---
+
+# PROCESS Service checks with `opcdbg`
+
+`opcdbg` is interactive. Answers can be piped in, one per line, in Bash; always add a time-out
+and end with `-1` lines, because on end of input it repeats the last prompt forever. `opcdbg 0
+<menu>` starts in a menu on node 0 (this node). Times are printed in **GMT**.
+
+Only the actions below are read-only. Do not use insert/modify/delete, *Database repair*,
+*Reset* (utilities) or *Modify attribute value* without the user's approval.
+
+| Check | Command (Bash) | Output |
+|---|---|---|
+| Database consistency | `printf '5\n-1\n-1\n' \| timeout 60 opcdbg 0 5` | Counts per store (trigger groups, classes, sources, code, objects, signals, attributes), then checks; warnings such as `No compiled code found for class (cls_id = …)` |
+| Class details | `printf '2\n5\nN\n<CLASS>\n-1\n-1\n' \| timeout 20 opcdbg 0` | Language, priority, modified/compiled times, cls_id, objects derived / reset, hidden |
+| Class by id (from a warning) | `printf '2\n5\nI\n<sec>\n<seq>\n-1\n-1\n' \| timeout 20 opcdbg 0` | Same; `Compiled at : 0` = never compiled |
+| Object details | `printf '3\n4\nN\n<object>\n-1\n-1\n' \| timeout 20 opcdbg 0` | Priority, control item id, times, cls_id/obj_id |
+| Object status | `printf '3\n18\n<object>\n-1\n-1\n' \| timeout 20 opcdbg 0` | Total runs, executor (`Running in : 1, OPCEXE1`) |
+| Object signals / attributes | `3` then `14` / `12`, object name | Signal → item id; attribute → type (LOCAL/GLOBAL) |
+| Executor statistics | `printf '0\nOPCEXE1\n1\n-1\n-1\n' \| timeout 20 opcdbg 0 4` | Active classes/objects/trigger groups/items, number of executions; times stay 0 unless `STATISTICS = YES` in `opc.sup` |
+
+Executor names on R1.03: `OPCEXE1`…`OPCEXE4` (Traditional, priority ranges 0–249 … 750–999)
+and `OPCJEXE` (Java). The prompt's default `OPCEXE` does not exist.
+
+Easier for names: the datasets `OBJECT_SIGNAL_DF` (object:signal → item name) and
+`OBJECT_ATTR_VAL` / `CLASS_ATTR_VAL` (attribute values) via `dssqld -e` with a filter — see
+`traditional-class.md` §3.
+
+## Dumps
+
+*Utilities* 3 / 4 (`printf '3\nclasses.qli\n4\nobjects.qli\n-1\n-1\n' | timeout 30 opcdbg 0 5`)
+write all class sources / objects to files in the current folder. The format is an old one
+(`NAME,"description",priority` then source lines starting with `- `) and **`dssqld -i` rejects
+it** (`DSS-E-UNK_DS_NM`, ISS-027). To move classes and objects to another system, export
+`CLASS_DF` and `OBJECT_DF` with `dssqld -e` instead (task `load-class-object.md`; migration in
+`knowledge/manuals/IM36K10J10-01EN.md` §5.6).
+
+## Observed on the test system
+
+The database check reported one warning for a class `SINUS` (not from this repo) that was
+never compiled; everything else was consistent. A class like that is harmless but can be
+compiled or removed by its owner.
diff --git a/.claude/skills/class-object-engineering/tasks/traditional-class.md b/.claude/skills/class-object-engineering/tasks/traditional-class.md
new file mode 100644
index 0000000..f77dae3
--- /dev/null
+++ b/.claude/skills/class-object-engineering/tasks/traditional-class.md
@@ -0,0 +1,91 @@
+---
+task: Write a Traditional class with prompts, signals built from the object name, and items created from a template
+version: R1.03
+source: IM 36K10P10-01EN §1–§5, §8, §10, §11.2.8; IM 36K10L10-01EN; practiced with CI-Eng-Sample class CIENG_TANK 2026-09-30
+status: verified
+---
+
+# Traditional class: prompts, signals, created items
+
+Worked example: class `CIENG_TANK` and object `CI-Eng-Sample.TANK1.CALC`
+(`examples/CI-Eng-Sample/06_class_df.qli`, `07_object_df.qli`). Loading and removing: task
+`load-class-object.md`. Language reference: `knowledge/manuals/IM36K10P10-01EN.md`.
+
+## 1. Design
+
+One class = one kind of equipment; one object per piece of equipment. Put the variable parts
+(which items, which settings) in the **class prolog** so they are fixed when each object is
+created:
+
+| Need | Use |
+|---|---|
+| Setting per object, asked at creation | `ATTRIBUTE x OBJECT FLOAT;` + `PROMPT x QUERY "…";` → `ATTR_VALUE_n` in `OBJECT_DF` |
+| Setting shared by all objects | `ATTRIBUTE x CLASS …;` |
+| Existing item next to the object | `SIGNAL s := SECTION || ".<TAG>" TRIGGER VALUE;` |
+| New item per object | `SIGNAL s := FROM "<template item>" MAKE "FIELD" EQUAL value …;` |
+| Refuse bad input | `IF … THEN ERROR "text"; ENDIF;` in the class prolog |
+| Periodic run | trigger group on the class (`TRIGGER_1`) or object |
+| Run on a change | `TRIGGER VALUE` (or STATUS, UPDATE …) on the signal |
+
+Template items: keep them in their own section (sample: `CI-Eng-Sample.TEMPLATES.TPL_REAL`)
+and load them before the class.
+
+## 2. Example
+
+```
+CLASS CIENG_TANK;
+  PROLOG
+    ATTRIBUTE CAPACITY OBJECT FLOAT;
+    PROMPT CAPACITY QUERY "Tank capacity (m3)";
+    SIGNAL LEVEL := SECTION || ".LEVEL" TRIGGER VALUE;
+    SIGNAL VOLUME := FROM "CI-Eng-Sample.TEMPLATES.TPL_REAL" MAKE
+      "DESCRIPTION" EQUAL "Tank volume (m3), class CIENG_TANK";
+    IF CAPACITY <= 0 THEN
+      ERROR "CIENG_TANK: capacity must be > 0";
+    ENDIF;
+  BODY
+    METHOD CALC;
+      BODY
+        VOLUME := LEVEL * CAPACITY / 100.0;
+        IF LEVEL >=: 80.0 THEN
+          PRINT "CIENG_TANK ", SECTION, ": level reached 80 pct, volume ", VOLUME;
+        ENDIF;
+    ENDMETHOD CALC;
+ENDCLASS CIENG_TANK;
+```
+
+Object `CI-Eng-Sample.TANK1.CALC` with `ATTR_VALUE_1` = `"200"`:
+
+- `SECTION` = `CI-Eng-Sample.TANK1`, so `LEVEL` → `CI-Eng-Sample.TANK1.LEVEL`.
+- `VOLUME` has no `"NAME"`, so the item is `CI-Eng-Sample.TANK1.CALC.VOLUME`; the section
+  `TANK1.CALC` is created too. Both are deleted with the object.
+- `LEVEL` 50 → `VOLUME` 100; 82 → 164.
+- `>=:` prints once when the level **crosses** 80 (message in `umhlog.log`, sender `OPCEXE1`).
+
+Rules learned on the test system:
+- Do not put `%` in `PRINT` text: the message is cut at that point (ISS-025).
+- An object at root level has an empty `SECTION`; build names with an `IF` then (release notes).
+- Item names in `SIGNAL` strings must match exactly; an item that does not exist makes the
+  object creation fail.
+
+## 3. Check and operate
+
+- Signals → items: export `OBJECT_SIGNAL_DF` with filter `'OBJECT = "<object>"'`
+  (sample: `…CALC:LEVEL` → `CI-Eng-Sample.TANK1.LEVEL`, `…CALC:VOLUME` → `…CALC.VOLUME`).
+- Attribute values: export `OBJECT_ATTR_VAL` (same filter); record name
+  `<object>:<attribute>`, field `ATTR_VALUE`.
+- **Change an attribute of a running object** (verified): `dssqld -m` on `OBJECT_ATTR_VAL`:
+  ```
+  @FIELDS
+  NAME,ATTR_VALUE
+
+  @OBJECT_ATTR_VAL
+  "CI-Eng-Sample.TANK1.CALC:CAPACITY","400"
+  ```
+  The new value is used from the next run (level 50 → volume 200). Do not change attributes
+  that were used to build signal names: the signal keeps its old item (P10 §8.3).
+- Class-wide attributes: `CLASS_ATTR_VAL` (`<class>:<attribute>`), not practiced.
+- Refused object: loading `ATTR_VALUE_1` = `"0"` gave `Errors 1` with
+  `OPC-E-INFO, CIENG_TANK: capacity must be > 0` in the `.qlo`; nothing was created.
+
+Changing the class source later: task `change-reset-class.md`.
diff --git a/examples/CI-Eng-Sample/01_section_df.qli b/examples/CI-Eng-Sample/01_section_df.qli
index bd48bdd..b8a5ad1 100644
--- a/examples/CI-Eng-Sample/01_section_df.qli
+++ b/examples/CI-Eng-Sample/01_section_df.qli
@@ -10,6 +10,7 @@ NAME,SECTION_PATH,SECTION_NAME,DESCRIPTION
 
 @SECTION_DF
 "CI-Eng-Sample","","CI-Eng-Sample","CI-Eng-Sample project"
+"CI-Eng-Sample.TEMPLATES","CI-Eng-Sample","TEMPLATES","Template items for classes"
 "CI-Eng-Sample.TANK1","CI-Eng-Sample","TANK1","Sample tank 1"
 "CI-Eng-Sample.PUMP1","CI-Eng-Sample","PUMP1","Sample pump 1"
 "CI-Eng-Sample.SYSTEM","CI-Eng-Sample","SYSTEM","Sample system monitoring"
diff --git a/examples/CI-Eng-Sample/02_item_df.qli b/examples/CI-Eng-Sample/02_item_df.qli
index 8ff1a91..6f78b41 100644
--- a/examples/CI-Eng-Sample/02_item_df.qli
+++ b/examples/CI-Eng-Sample/02_item_df.qli
@@ -10,6 +10,7 @@ NAME,DESCRIPTION,ITEM_REP,VALUE_FORMAT
 LOW_LOW_LIMIT,LOW_LIMIT,HIGH_LIMIT,HIGH_HIGH_LIMIT,SCALE_LOW_LIMIT,SCALE_HIGH_LIMIT
 
 @ITEM_DF
+"CI-Eng-Sample.TEMPLATES.TPL_REAL","Template: internal real item","Real","9999.9",0,0,0,0,0,1000
 "CI-Eng-Sample.TANK1.LEVEL","Tank 1 level (%)","Real","999.9",10,20,80,90,0,100
 "CI-Eng-Sample.TANK1.INFLOW","Tank 1 inflow (m3/h)","Real","9999.9",0,0,0,0,0,500
 "CI-Eng-Sample.PUMP1.RUNNING","Pump 1 running","Boolean","",0,0,0,0,0,0
diff --git a/examples/CI-Eng-Sample/06_class_df.qli b/examples/CI-Eng-Sample/06_class_df.qli
index 950b67b..fd08f11 100644
--- a/examples/CI-Eng-Sample/06_class_df.qli
+++ b/examples/CI-Eng-Sample/06_class_df.qli
@@ -4,8 +4,12 @@ ENGLISH
 @VERSION
 1.03.00
 
-! CI-Eng-Sample class (traditional language), compiled on load (COMPILE = 1)
-! Based on the INCREMENT example in the CI Server Tutorial (IM 36K10G10-01EN 5.2)
+! CI-Eng-Sample classes, compiled on load (COMPILE = 1), CI Server R1.03.00
+! CIENG_INCR : traditional, based on the INCREMENT example of the Tutorial (IM 36K10G10-01EN 5.2)
+! CIENG_TANK : traditional; prompt/attribute, signal to <object section>.LEVEL, item created from
+!              the template TEMPLATES.TPL_REAL (automatic name <object>.VOLUME), ERROR in the prolog
+! CIENG_JFLOW: Java; attaches <object section>.INFLOW, creates <object>.sPerMin (automatic name)
+! Changing a class that has objects: compile, then reset the class (see skill class-object-engineering).
 @FIELDS
 NAME,DESCRIPTION,PF_LANGUAGE,TRIGGER_1,COMPILE,LISTING_WANTED,METHOD
 
@@ -24,3 +28,45 @@ CLASS CIENG_INCR;
     ENDMETHOD UP_AND_DOWN;
 ENDCLASS CIENG_INCR;
 "@
+"CIENG_TANK","Tank volume from level x capacity","Traditional","",1,1,@"
+CLASS CIENG_TANK;
+  PROLOG
+    ATTRIBUTE CAPACITY OBJECT FLOAT;
+    PROMPT CAPACITY QUERY "Tank capacity (m3)";
+    SIGNAL LEVEL := SECTION || ".LEVEL" TRIGGER VALUE;
+    SIGNAL VOLUME := FROM "CI-Eng-Sample.TEMPLATES.TPL_REAL" MAKE
+      "DESCRIPTION" EQUAL "Tank volume (m3), class CIENG_TANK";
+    IF CAPACITY <= 0 THEN
+      ERROR "CIENG_TANK: capacity must be > 0";
+    ENDIF;
+  BODY
+    METHOD CALC;
+      BODY
+        VOLUME := LEVEL * CAPACITY / 100.0;
+        IF LEVEL >=: 80.0 THEN
+          PRINT "CIENG_TANK ", SECTION, ": level reached 80 pct, volume ", VOLUME;
+        ENDIF;
+    ENDMETHOD CALC;
+ENDCLASS CIENG_TANK;
+"@
+"CIENG_JFLOW","Inflow per minute (Java)","Java","",1,0,@"
+import fasttools.processfast.*;
+
+public class CIENG_JFLOW extends ProcessClass {
+
+    Signal sInflow = defineDoubleSignal(Signal.Trigger.VALUE);
+    Signal sPerMin = defineDoubleSignal();
+
+    public void create() {
+        attachItemToSignal(sInflow, getSectionsPath() + ".INFLOW");
+        createItemForSignal(sPerMin, "CI-Eng-Sample.TEMPLATES.TPL_REAL",
+            "DESCRIPTION", "Tank inflow (m3/min), class CIENG_JFLOW");
+    }
+
+    public void signalEvent(Signal signal) {
+        double mInflow = sInflow.getValueAsDouble();
+        sPerMin.setValue(mInflow / 60.0);
+        systemMessage("CIENG_JFLOW " + getTag() + ": inflow " + mInflow);
+    }
+}
+"@
diff --git a/examples/CI-Eng-Sample/07_object_df.qli b/examples/CI-Eng-Sample/07_object_df.qli
index f6d407c..7d7e19a 100644
--- a/examples/CI-Eng-Sample/07_object_df.qli
+++ b/examples/CI-Eng-Sample/07_object_df.qli
@@ -4,9 +4,12 @@ ENGLISH
 @VERSION
 1.03.00
 
-! CI-Eng-Sample object created from class CIENG_INCR
+! CI-Eng-Sample objects, CI Server R1.03.00
+! ATTR_VALUE_n answers the class's n-th PROMPT (CIENG_TANK: capacity in m3).
 @FIELDS
-NAME,DESCRIPTION,CLASS
+NAME,DESCRIPTION,CLASS,ATTR_VALUE_1
 
 @OBJECT_DF
-"CI-Eng-Sample.DEMO.INCR1","Counts DEMO.COUNTER every second","CIENG_INCR"
+"CI-Eng-Sample.DEMO.INCR1","Counts DEMO.COUNTER every second","CIENG_INCR",""
+"CI-Eng-Sample.TANK1.CALC","Tank 1 volume (capacity 200 m3)","CIENG_TANK","200"
+"CI-Eng-Sample.TANK1.JFLOW","Tank 1 inflow per minute (Java)","CIENG_JFLOW",""
diff --git a/examples/CI-Eng-Sample/86_remove_object_df.qli b/examples/CI-Eng-Sample/86_remove_object_df.qli
index cb77b92..34f70e2 100644
--- a/examples/CI-Eng-Sample/86_remove_object_df.qli
+++ b/examples/CI-Eng-Sample/86_remove_object_df.qli
@@ -10,3 +10,5 @@ NAME
 
 @OBJECT_DF
 "CI-Eng-Sample.DEMO.INCR1"
+"CI-Eng-Sample.TANK1.CALC"
+"CI-Eng-Sample.TANK1.JFLOW"
diff --git a/examples/CI-Eng-Sample/87_remove_class_df.qli b/examples/CI-Eng-Sample/87_remove_class_df.qli
index 8ee27d5..0229de9 100644
--- a/examples/CI-Eng-Sample/87_remove_class_df.qli
+++ b/examples/CI-Eng-Sample/87_remove_class_df.qli
@@ -10,3 +10,5 @@ NAME
 
 @CLASS_DF
 "CIENG_INCR"
+"CIENG_TANK"
+"CIENG_JFLOW"
diff --git a/examples/CI-Eng-Sample/91_remove_item_df.qli b/examples/CI-Eng-Sample/91_remove_item_df.qli
index f67e82b..5c33008 100644
--- a/examples/CI-Eng-Sample/91_remove_item_df.qli
+++ b/examples/CI-Eng-Sample/91_remove_item_df.qli
@@ -19,3 +19,4 @@ NAME
 "CI-Eng-Sample.SYSTEM.PROC_ALM"
 "CI-Eng-Sample.DEMO.COUNTER"
 "CI-Eng-Sample.PLC1.COMM_OK"
+"CI-Eng-Sample.TEMPLATES.TPL_REAL"
diff --git a/examples/CI-Eng-Sample/92_remove_section_df.qli b/examples/CI-Eng-Sample/92_remove_section_df.qli
index 62fed29..7070088 100644
--- a/examples/CI-Eng-Sample/92_remove_section_df.qli
+++ b/examples/CI-Eng-Sample/92_remove_section_df.qli
@@ -14,4 +14,5 @@ NAME
 "CI-Eng-Sample.SYSTEM"
 "CI-Eng-Sample.PLC1"
 "CI-Eng-Sample.DEMO"
+"CI-Eng-Sample.TEMPLATES"
 "CI-Eng-Sample"
diff --git a/examples/CI-Eng-Sample/README.md b/examples/CI-Eng-Sample/README.md
index 5212346..dab3942 100644
--- a/examples/CI-Eng-Sample/README.md
+++ b/examples/CI-Eng-Sample/README.md
@@ -46,6 +46,12 @@ cmd /c "<repo>\examples\CI-Eng-Sample\remove.cmd"
 | `CIENG_1S` | Trigger group | Every second |
 | `CIENG_INCR` | Class (traditional) | Increments `DEMO.COUNTER`, wraps at 100; compiled on load |
 | `CI-Eng-Sample.DEMO.INCR1` | Object | Instance of `CIENG_INCR` |
+| `CI-Eng-Sample.TEMPLATES` | Section | Template items for classes |
+| `CI-Eng-Sample.TEMPLATES.TPL_REAL` | Item, Real | Template for items that objects create (format `9999.9`, scale 0–1000) |
+| `CIENG_TANK` | Class (traditional) | Prompt *Tank capacity (m3)*; signal `LEVEL` = `<object section>.LEVEL` (trigger on value); creates `<object>.VOLUME` from `TPL_REAL`; volume = level × capacity / 100; logs when the level crosses 80; refuses capacity ≤ 0 |
+| `CI-Eng-Sample.TANK1.CALC` | Object | `CIENG_TANK`, capacity 200; creates section `TANK1.CALC` and item `TANK1.CALC.VOLUME` |
+| `CIENG_JFLOW` | Class (Java) | Attaches `<object section>.INFLOW`; creates `<object>.sPerMin` = inflow / 60; logs each change |
+| `CI-Eng-Sample.TANK1.JFLOW` | Object | `CIENG_JFLOW`; creates item `TANK1.JFLOW.sPerMin` (mixed case, as the Java identifier) |
 | `CIENG_EVENT` | Item storage group | Event/Item, lifetime 1 week, rollover 1 day |
 | `CI-Eng-Sample.PLC1` | Section | Modbus loopback station |
 | `CI-Eng-Sample.PLC1.COMM_OK` | Item, Boolean | Status item of station `CIENG_PLC` (1 = communicating, status 22 when off-scan) |
@@ -56,6 +62,9 @@ cmd /c "<repo>\examples\CI-Eng-Sample\remove.cmd"
 | `CIENG_SCAN1S` | Modbus scan type | 1000 ms |
 | `CIENG_VIEWER` | Authorization group | Read-only: `ITEM_READ`, `SECTION_READ`, `ALARM_CURRENT_READ`, `ALARM_CHRONO_READ`. No users are created by the sample. |
 
+Items created by objects (`TANK1.CALC.VOLUME`, `TANK1.JFLOW.sPerMin`) and their sections are
+deleted with the objects; they are not in `02_item_df.qli`.
+
 All items except `PLC1.*` are internal (no station). The `PLC1` station talks to CI Server's own Modbus slave mirror (see below), so no PLC is needed either.
 New items start with status 13 (`NOT INIT`) until a value is written.
 
@@ -68,7 +77,7 @@ New items start with status 13 (`NOT INIT`) until a value is written.
 | `02b_sub_item_df.qli` | Sub-items (`SUB_ITEM_DF`) |
 | `03_his_group_df.qli` | Item storage group (`HIS_GROUP_DF`) |
 | `04_item_his_df.qli` | Items in the storage group (`ITEM_HIS_DF`, name `<group>:<item>`) |
-| `05_trigger_df.qli`, `06_class_df.qli`, `07_object_df.qli` | Trigger group, class (source in the `METHOD` memo, `@"` … `"@`, `COMPILE` 1), object |
+| `05_trigger_df.qli`, `06_class_df.qli`, `07_object_df.qli` | Trigger group; classes (source in the `METHOD` memo, `@"` … `"@`, `COMPILE` 1; Traditional and Java); objects (`ATTR_VALUE_1` = prompt answer) |
 | `08_auth_group_df.qli` | Authorization group (`AUTH_GROUP_DF`) |
 | `09_modbus_line_df.qli`, `10_modbus_station_df.qli`, `11_item_eqp_df.qli` | Modbus line; station, scan type, points; items connected to points |
 | `equipment/eqpciengslv_start.cmd`, `_stop.cmd` | Start/stop the Modbus slave mirror (copy to `tls\com`) |
@@ -103,7 +112,6 @@ testing. See the `system-management` skill, task `monitoring-processes.md`.
 
 | Phase | Adds |
 |---|---|
-| 6 | Template items, a class with attributes/prompts, objects that create items |
 | 8 | Alarm settings on sample items |
 | 9 | More storage groups (scan/time, aggregation) |
 | 10 | A display and symbol |
diff --git a/knowledge/issues.md b/knowledge/issues.md
index 03b91ac..646df07 100644
--- a/knowledge/issues.md
+++ b/knowledge/issues.md
@@ -44,3 +44,8 @@ development system (see "Test system" in `progress.md`); they do not exist on ot
 | ISS-022 | 2026-09-30 | ITEM (`itmval -f`) | `itmval -f <file> vs -n CI-Eng-Sample.TANK1.LEVEL` (IM 36K10L36 §1.4, write a restore command) crashes with a segmentation fault (bash) / access violation 0xC0000005 (PowerShell) and writes no file; also with `-l`. The manual's space-separated form `-n <inst> <unit> <tag>` is rejected with `FSL-E-NARG_ALL`. `itmval -g`/`-p` work. | open | Workaround: build restore lines from `itmval -g` output. Report to Yokogawa support if needed. | `knowledge/manuals/IM36K10L36-01EN.md` §3; `.claude/skills/system-management/tasks/read-write-item.md` |
 | ISS-023 | 2026-09-30 | ITEM / ITH (manual vs install) | Installed ITEM Service differs from IM 36K10L35/L36: `item_start.cmd` starts `itheix` (EVENT/ITEM storage, not described), aggregation `ithsag`/`ithrag`, two instances of each retrieve process, and `itmtim 100 1000 1 200 1` (five arguments, three documented); `itm.sup` item pool is 650000 KB (manual default 50000) and has `not_regained` (not described); `itheix.sup` has `max_sample_delay`, `max_samples_queued`, `max_open_files`. | closed | Closed 2026-09-30 (user decision: the installed software is the reference). Summaries describe the installed values. | `knowledge/manuals/IM36K10L35-01EN.md`; `knowledge/manuals/IM36K10L36-01EN.md` |
 | ISS-024 | 2026-09-30 | EQUIPMENT (Modbus slave) | IM 36K10L41 §3.7 says `EQPMDCSLVTCP` waits for "MODBUS RTU requests via TCP/IP" and the CI Server master should use "MODBUS RTU via TCP/IP". A Modbus master station with `PROTOCOL = RTU` to `eqpmdcslvtcp` (port 5020) got no answer (`EQP-E-TCPRCVTMO`, 4 requests, 0 valid); with `Open Modbus/TCP` it worked at once. | closed | Closed 2026-09-30 (user decision: installed software is the reference). Use `Open Modbus/TCP` towards `eqpmdcslvtcp`. | `knowledge/manuals/IM36K10L41-01EN.md` §3.7; `.claude/skills/equipment/tasks/modbus-station.md` |
+| ISS-025 | 2026-09-30 | PROCESS (PRINT) | A Traditional `PRINT "… 80 %, volume ", VOLUME;` logged `OPC-I-INFO, UMH Message Text Error: Message number 083A001B (… level reached 80 )`: the text is cut at the `%` and the rest is lost. Without `%` the full text is logged. | open | Avoid `%` in PRINT/ERROR text (sample uses "pct"). Check whether `%%` or `\%` gives a literal percent sign. | `knowledge/manuals/IM36K10P10-01EN.md` §4; `.claude/skills/class-object-engineering/tasks/traditional-class.md` |
+| ISS-026 | 2026-09-30 | PROCESS (`opc.sup`) | Installed PROCESS setup differs from IM 36K10L10 §2: `IMMED-EVENTS = NO` (manual: default on); `FLOW-CONTROL = 30,60` (manual 300/360 s); four executors `OPCEXE1`–`4` with fixed priority ranges (manual examples `OPCEXE01`…) and `opcdbg` still defaults to `OPCEXE`; keyword `VARTAB-SIZE` (manual `VARITAB-SIZE`); hidden keywords `FLDSEP`, `IGNEXI` not described; `ALARM-ITEMS` not set; class source file `opc_clssrc.dat` (manual `opc_clasrc.dat`); `opcini.sup` (licence line) not described. | open | Installed software is the reference (standing user decision); summary written from the installed files. Close when the user confirms. | `knowledge/manuals/IM36K10L10-01EN.md` §2, §5 |
+| ISS-027 | 2026-09-30 | PROCESS (`opcdbg`) | IM 36K10L10 §4 says the `opcdbg` *Dump classes/objects* files can be read by `dssqld`. The files have no `@LANGUAGE`/`@FIELDS`/`@<dataset>` headers (`NAME,"desc",prio` + source lines prefixed `- `); `dssqld -i` on the object dump gave `DSS-E-UNK_DS_NM, Unknown data set name`. | open | Use `dssqld -e CLASS_DF` / `OBJECT_DF` for transfers. Maybe an old tool reads the dump format; not found. | `knowledge/manuals/IM36K10L10-01EN.md` §4; `.claude/skills/class-object-engineering/tasks/opcdbg-checks.md` |
+| ISS-028 | 2026-09-30 | PROCESS (class reset) | After recompiling a class with objects (`RESET_REQUIRED` 1), `dssqld -m` with `CLASS_DF` `RESET` = 1 (also with `RESET_NODE` = host node name) is accepted with 0 errors but does not reset; `OBJECT_DF` `RESET` = 1 is refused (`OPC-E-OBJ_RSTREQ`). `opcdbg` Classes → 8 *Reset class* works; it asks for a reset report file, which the manual does not list. | open | Use `opcdbg`. Still to try: `CLASS_RESET_COMMAND` (system-wide) and the Engineering Module's reset. | `.claude/skills/class-object-engineering/tasks/change-reset-class.md`; `knowledge/manuals/IM36K10L10-01EN.md` §4 |
+| ISS-029 | 2026-09-30 | PROCESS (Java) | IM 36K10P11 §10.4 says a new Java class must be reset before objects are added, otherwise the code does not take effect. A Java class inserted with `COMPILE` 1 by `dssqld` ran its first object correctly without any reset (twice, including a full sample reload). | open | Installed behaviour is the reference; keep "reset after changing a class that has objects". Check whether the Engineering Module path (compile without quick load) behaves differently. | `knowledge/manuals/IM36K10P11-01EN.md` §7; `.claude/skills/class-object-engineering/tasks/java-class.md` |
diff --git a/knowledge/manuals/IM36K10L10-01EN.md b/knowledge/manuals/IM36K10L10-01EN.md
new file mode 100644
index 0000000..ff4883e
--- /dev/null
+++ b/knowledge/manuals/IM36K10L10-01EN.md
@@ -0,0 +1,118 @@
+---
+manual: IM 36K10L10-01EN
+title: Class/Object Engineering
+edition: 3rd Edition, Sep. 2023
+version: R1.03
+status: from docs; opc.sup, process_start.cmd, the PROCESS data files and opcdbg (database check, get class/object, signals, attributes, reset class, dump, performance main info) checked on the test system 2026-09-30
+---
+
+# Class/Object Engineering (R1.03)
+
+PROCESS Service runs **objects**: instances of **classes** (programs written in the
+Traditional or Java PROCESS Service language) that link a set of items through **signals** and
+are run by **trigger groups**, signal changes or timers. Internally all its process names start
+with `OPC` ("Object oriented Process Control") — nothing to do with the OPC Foundation
+standard. Section numbers refer to the manual. Language details: `IM36K10P10-01EN.md`
+(Traditional) and `IM36K10P11-01EN.md` (Java).
+
+## 1. Processes (§1)
+
+| Process | Role |
+|---|---|
+| `OPCMAN` | Manager: keeps the configuration (trigger groups, classes, objects); every client request goes through it |
+| `OPCCOM` / `OPCJCOM` | Compiler for Traditional / Java classes |
+| `OPCACT` / `OPCJACT` | Activator: creates/deletes objects (runs the class prolog / `create()`), creates and deletes the items an object makes |
+| `OPCLOA` | Loader: passes run information to the executors; keeps a private copy of the data store on a front-end node |
+| `OPCEXE` / `OPCJEXE` | Executor: runs the objects (Traditional / Java); creates the ALARM-statement items |
+| `opcdbg` | Command-line debugger (see §4) |
+
+Rules for distributed systems: `OPCMAN`, the compilers and activators run together on the host
+node, one of each. Loader/executor pairs may run on other nodes; several executors per node
+are allowed, each serving its own **priority range** (0–999).
+
+**Installed (R1.03 test system)**: `process_start.cmd` starts `opcloa`; on the host node also
+`opcman`, `opcact`, `opccom`; then **four** Traditional executors `opcexe1`…`opcexe4` and one
+Java executor `opcjexe` (a `javaw` process). `OPCJCOM`/`OPCJACT` are not started by the script;
+`OPCMAN` starts them on demand (`process_jcom_start.cmd`, `process_jact_start.cmd`) and they exit
+after an idle time. Java process logging is configured in
+`%TLS_WAP_PATH%\cfg\properties\opcj{act,com,exe}logging.properties`.
+
+## 2. Setup files (§2)
+
+`opc.sup` holds settings for all PROCESS processes; a file named after one process's BUS queue
+(e.g. `opcman.sup`) overrides it for that process only. The Java processes read only `opc.sup`.
+Change it with the Setup File Editor (skill `portal-setup`); a restart is needed.
+
+Main keywords and the **installed** values (differences from the manual: ISS-026):
+
+| Keyword | Meaning | Installed |
+|---|---|---|
+| `CLASS-TEMPLATE`, `JCLASS-TEMPLATE` | Source template for new classes | not set → `%TLS_DAT_PATH%\opc_src_tpl.asc` / `opc_jsrc_tpl.asc` |
+| `EVENT-BUFFER = node, size, time-out` | ITEM Service buffers item events for PROCESS | `-1, 1000, 0.1` (all nodes) |
+| `IMMED-EVENTS` | One extra update per item when an executor starts | `NO` (manual: default YES) |
+| `COLD-START` | Front-end loads everything from the host at start (legacy) | `NO` |
+| `AUDIT` | Audit trail for configuration and value changes | `NO` |
+| `FLOW-CONTROL = interval, timeout` (s) | Heartbeat from ITEM Service; `0,0` disables | `30,60` (manual default 300/360) |
+| `TRIGGER-QUEUE-SIZE` | Queued triggers per object; at 90 % a "Loosing real-time" warning | `100` |
+| `ALARM-ITEMS`, `ALARM-PRIORITY` | Items and priorities for the language's ALARM statement | not set |
+| `HOST-NODE` | PROCESS host node | `-1` (the system host) |
+| `ALM-PROC`, `ADT-PROC`, `ITM-PROC` | Queue names of ALARM, AUDIT, ITEM Service | `ITM-PROC = ITM` |
+| `PROC-TIME = wait s, jact min, jcom min` | Start wait and idle time-outs of `OPCJACT`/`OPCJCOM`; 0 = 30 min | `20,0,0` |
+| `QUEUE-SIZE = process, kB` | BUS queue sizes | `OPCEXE1`–`4` 300, `OPCMAN` 400, `OPCLOA` 252 |
+| `PRIORITY-RANGE = executor, from, to` | Priority range per executor; must not overlap | `OPCEXE1` 0–249, `OPCEXE2` 250–499, `OPCEXE3` 500–749, `OPCEXE4` 750–999 |
+| `LOCK-CHECK` (s) | Manager housekeeping interval | `10` |
+| `SCHEDULER-INTERVAL` (ms) | Finest run resolution for Traditional objects | `500` |
+| `TRACE` | Debug output of `OPCEXE` to stdout | `NO` |
+| `STATISTICS` | Performance statistics for `opcdbg` (Traditional; Java always on) | `NO` |
+| `PRINT` | `PRINT` statement output goes to the message log | `YES` |
+| `SYMTAB-SIZE`, `INCTAB-SIZE`, `ALARMTAB-SIZE`, `TIMERTAB-SIZE`, `ATTRIBTAB-SIZE`, `SIGTAB-SIZE`, `LABELTAB-SIZE`, `VARTAB-SIZE`, `FNCTAB-SIZE`, `STRPOOL-SIZE`, `CODE-SIZE` | Compiler table sizes (Traditional) | 4000, 100, 40, 40, 1000, 1000, 100, 4000, 200, 32 kB, 1000 kB |
+
+Also in the file: hidden keywords `FLDSEP = ","` and `IGNEXI = 1` (not described). `opcini.sup`
+holds only a licence line; leave it alone.
+
+The object's priority decides which executor runs it: sample objects with priority 0 run in
+`OPCEXE1` (seen with `opcdbg`, "Running in : 1, OPCEXE1").
+
+## 3. Ways to create classes and objects (§3)
+
+1. Engineering Module (normal GUI way).
+2. `opcdbg` (repair situations).
+3. An application using the PROCESS routine interface.
+4. **Quick load** with `dssqld` (`CLASS_DF`, `OBJECT_DF`, `TRIGGER_DF`) — used by this repo;
+   see skill `class-object-engineering`.
+
+## 4. Debugger `opcdbg` (§4)
+
+Interactive; first asks the OPC host node (0 = this node), then the action:
+`1` trigger groups, `2` classes, `3` objects, `4` performance, `5` utilities, `-1` exit.
+`opcdbg 0 <action>` skips the first two questions. Answers can be piped in (one per line); end
+with `-1` lines so it exits, and keep a time-out: on end of input it repeats the last prompt
+forever.
+
+| Menu | Useful actions |
+|---|---|
+| Classes (2) | 5 get class (by **N**ame or **I**d — asked first), 7 compile, 8 **reset class** (all its objects on a node), 12 triggers, 16 all attributes, 18 all signals, 19/20 get/modify attribute value, 21 hide/unhide code |
+| Objects (3) | 4 get object (N/I first), 6 reset, 7 trigger, 12 all attributes, 14 all signals (with item ids), 15 debug on/off (writes a trace file), 16/17 get/modify attribute value, 18 object status (runs, executor) |
+| Performance (4) | Asks front-end node and **executor name** (default `OPCEXE`, installed names are `OPCEXE1`…`4`); 1 main info, 5 class info, 7 object info, 8 reset statistics, 9 statistics on/off, 10/11 top-10 classes/objects |
+| Utilities (5) | 1 reset host/front-end, 2 pending front-end updates, 3/4 dump classes/objects, **5 database check** (read-only), 6 database repair (deletes incomplete data; back up first), 7 disassemble class, 8 clean up "item used" marks, 9 memory dump |
+
+Verified 2026-09-30: *Reset class* asks class name, node **and a file for a reset report**
+(not in the manual; empty line = none). Times are printed in GMT. The dump files (3/4) are
+**not** in quick load format and `dssqld -i` rejects them (ISS-027); export `CLASS_DF` /
+`OBJECT_DF` with `dssqld -e` instead. *Cleanup item used file* fixes items that cannot be
+deleted because a removed object still marks them as used.
+
+## 5. Data store (Appendix 1)
+
+Owned by PROCESS Service, in `%TLS_DAT_PATH%`: `opc_clsdef` (class definitions), class source
+(installed name `opc_clssrc`, manual `opc_clasrc`), `opc_clsobj` (compiled code), `opc_objdef`,
+`opc_attrib` (attribute values of classes and objects), `opc_signal` (item per signal, with
+storage info), `opc_trgdef`, `opc_trgact` (trigger group ↔ class/object links), `opc_msgovf`
+(pending updates to front-ends). They depend on each other: losing one corrupts the whole
+store; check with `opcdbg` utilities 5, repair with 6. Back them up together (they are part of
+the `tls\dat` backup).
+
+Related datasets (read with `dssqld -e`, see `IM36K10J10-01EN.md`): `CLASS_DF`, `OBJECT_DF`,
+`TRIGGER_DF`, `CLASS_SIGNAL_DF`, `OBJECT_SIGNAL_DF` (object:signal → item), `CLASS_ATTR_VAL`,
+`OBJECT_ATTR_VAL` (attribute values, writable with `dssqld -m`), `CLASS_INCLUDED_DF`,
+`CLASS_RESET_COMMAND` (system-wide reset command used by the Engineering Module; not practiced).
diff --git a/knowledge/manuals/IM36K10P10-01EN.md b/knowledge/manuals/IM36K10P10-01EN.md
new file mode 100644
index 0000000..0e01318
--- /dev/null
+++ b/knowledge/manuals/IM36K10P10-01EN.md
@@ -0,0 +1,167 @@
+---
+manual: IM 36K10P10-01EN
+title: Class Description Language - Traditional
+edition: 3rd Edition, Sep. 2023
+version: R1.03
+status: from docs; PROLOG/ATTRIBUTE/PROMPT/ERROR, SIGNAL to an existing item and SIGNAL … FROM … MAKE, TRIGGER VALUE, the SECTION constant, transitional >=:, PRINT and runtime attribute change verified with CI-Eng-Sample class CIENG_TANK on 2026-09-30; everything else from docs
+---
+
+# Traditional PROCESS Service language (R1.03)
+
+Summary in own words; section numbers refer to the manual. Engineering of classes and objects:
+`IM36K10L10-01EN.md` and skill `class-object-engineering`.
+
+## 1. Structure (§1, §11.1)
+
+```
+CLASS <name>;                 { name max 15 characters }
+  PROLOG                      { optional class prolog: runs when an object is CREATED }
+    <local declarations, CONTAINS, ATTRIBUTE, PROMPT, SIGNAL, statements>
+  BODY                        { needed only when there is a class prolog }
+    <global declarations: CONSTANT, VAR, TIMER, ALARM, ITEM, FOR>
+    METHOD <name>;            { method name max 50 characters }
+      ENTRYCONDITION <cond>;  { optional guard }
+      <local declarations>
+      PROLOG <statements>     { optional: first run / after going on-line }
+      BODY <statements>
+      EPILOG <statements>     { optional: when deactivated }
+    ENDMETHOD <name>;
+ENDCLASS <name>;
+```
+
+- Comments: `{ … }`, may span lines.
+- All methods of an active object run "simultaneously" (like tasks), not in order.
+- Method parts by state: becoming active → prolog + body; staying active → body; becoming
+  inactive (entry condition false or object off-line) → epilog (Table 1.3-1).
+- **Control item** (optional, per object): blocked = methods suspended; off-line = stopped,
+  on-line again = start as new. Its value is `STEP` (below).
+- `SEQUENCE`/`SUBSEQUENCE` are old synonyms of `CLASS`/`METHOD`; do not use.
+- Enterprise classes (Enterprise Engineering Module): extra `MAKE` fields `CREATE_ITEM`,
+  `PUT_IN_HISTORY`, `ALARM_DETECTION` = `MASTER_ONLY` / `DELEGATE_ONLY` / `MASTER_AND_DELEGATE`;
+  ignored in local classes (§1.6).
+
+## 2. Declarations (§2, §11.2)
+
+| Declaration | Syntax (short) | Notes |
+|---|---|---|
+| Constant | `CONSTANT a := 1, b := 2.5;` | Type from the expression |
+| Variable | `VAR x [INTEGER\|FLOAT\|STRING];` | Default FLOAT; numbers convert, strings and numbers do not mix |
+| Timer | `TIMER t [TRIGGER];` | Value = seconds left; `t'status` STOPPED / RUNNING / EXPIRED (initial EXPIRED). Assign seconds to start; 0 → EXPIRED. `TRIGGER` runs the object on expiry |
+| Alarm | `ALARM a [TRIGGER];` | Value = alarm text, `a'status` NORMAL/A1/A2/A3 (OR `ACKNOWLEDGE`), `a'priority`. Needs `ALARM-ITEMS` in `opc.sup` (not set on the installed system) |
+| Attribute | `ATTRIBUTE n [OBJECT\|CLASS] [INTEGER\|FLOAT\|STRING];` | In class prolog only. OBJECT (default) = per object; CLASS = one value for all objects. Kept across restarts. Name max 15 |
+| Prompt | `PROMPT n QUERY "text";` / `NOPROMPT path;` | Asks the value of an OBJECT attribute when an object is created. Declaration, not a statement |
+| Containment | `CONTAINS alias := other_class;` | Include another class; access `alias.signal`, nest `a.b.signal` |
+| Signal | see §3 | In class prolog only |
+| Item / For | `FOR [node:]inst[.unit]; ITEM tag [TRIGGER type];` | Fixed item names (first two section levels only); prefer SIGNAL |
+
+Limits: identifiers 50 characters (class, attribute, signal, function names 15); string values
+max 255 characters.
+
+## 3. Signals (§2.3, §11.2.8)
+
+A signal links the object to an item whose name is computed **when the object is created**,
+so each object can use different items.
+
+```
+SIGNAL LEVEL := SECTION || ".LEVEL" TRIGGER VALUE;            { existing item }
+SIGNAL VOLUME := FROM "<template item>[;<station>:<template point>]" MAKE
+    "DESCRIPTION" EQUAL "text"  "NAME" EQUAL "<new item name>"  … ;  { create the item }
+```
+
+- Types `INTEGER`, `FLOAT` (default), `STRING` after the signal name.
+- `FROM … MAKE`: copies the template item (and point) and overrides the listed fields; any field
+  of `ITEM_DF`, `SUB_ITEM_DF`, `ITEM_HIS_DF` and the station's `POINT_DF` may be used (e.g.
+  `"STATION"`, `"POINT"`, `"IO_ADDRESS"`, `"ALARMING" EQUAL ON`, `"PROCESS_LIST" EQUAL "1,3"`).
+  Storage: `"GROUP_NAME" EQUAL "<group>"` followed by its storage fields (`"STORE_VALUE"`,
+  `"ON_VALUE_CHANGE"` …); up to 4 groups; order matters. A template's own history membership is
+  **not** copied.
+- Without `"NAME"` the item is named `<object>.[<containment path>.]<signal>` and missing
+  sections are created (verified: object `CI-Eng-Sample.TANK1.CALC`, signal `VOLUME` →
+  item `CI-Eng-Sample.TANK1.CALC.VOLUME`). Sub-items always need a name.
+- Items and sections the object created are **deleted with the object** (verified), unless the
+  object has `LEAVE_ITEMS`; existing items are only unlinked.
+- An empty template name creates nothing: the signal stays unattached (`sig'attached` false).
+- Creating a point that already exists fails the object creation.
+- Use `||` to build names; a comma in a SIGNAL statement is read as a list separator.
+- Release notes: if the object sits at root level `SECTION` is empty — build names as
+  `IF SECTION = "" THEN tag ELSE SECTION || "." || tag`; prefer automatic naming.
+
+**Trigger types** (combine with `|`): `VALUE`, `STATUS`, `OPTION`, `UPDATE`, `FIRST`, `PIT`,
+`LIMIT`, `QUALITY`.
+
+**Signal attributes** (`sig'attr`; plain `sig` = value): `VALUE`, `OLD_VALUE`, `STATUS`,
+`CONTROL_STATUS`, `OPTION_STATUS` (`OPT_BLOCKED`, `OPT_OFF_LINE`, … with bitwise operators),
+`MERGED_STATUS`, `ALARM_TYPE`, `ACKNOWLEDGED`, the four limits, `DEADBAND`, `QUALITY`,
+`UPDATE_TIME`, `ID_*`, `SECTION`, `TAG`, `SUB`, `APPLICATION_INFO[i]`/`_SIZE`/`_FLAG`,
+`LOCKED`, `ATTACHED`. Which are writable differs between the manual's two tables (§2.3 vs
+§11.2.8); value and limits are writable in both. To set value and status together use
+`SIG_UPDATE`.
+
+**Object constants**: `NOW` (GMT, float seconds), `NODE`, `INSTALLATION`, `UNIT`, `SECTION`
+(object's section path — verified), `TAG` (object's tag), `CLASS`.
+
+## 4. Statements and expressions (§3–5, §11.4–11.5, §11.7)
+
+| Statement | Example | Notes |
+|---|---|---|
+| Assignment | `x := 12;` | To variable, signal (writes the item), attribute, timer, alarm |
+| Add | `x :+ 5;` / `x :+ -5;` | |
+| IF | `IF c THEN … [ELSE …] ENDIF;` | Nestable |
+| TRIGGER | `TRIGGER 60;` / `TRIGGER CLASS alias;` | Run again after n s (last one wins); trigger a contained class |
+| PRINT | `PRINT "text ", x;` | To the message log when `PRINT = YES` (installed). A `%` in the text cuts the message (ISS-025) |
+| ERROR | `ERROR "text";` | In a method: logs and stops this run. In the class prolog: **object creation is refused** and the text is returned (verified: `dssqld` `.qlo` shows `OPC-E-INFO, <text>`) |
+| STEP | `ENTRYCONDITION STEP = 2; … STEP := 3;` | Value of the control item; state machine between methods |
+
+Operators, highest first: unary `+ -`; `NOT ~`; `* /`; `+ -`; string `||` and `,` (comma also
+joins numbers); `= <> =: <>:`; `< > <= >= <: >: <=: >=:`; `&`; `^`; `|`; `AND`; `XOR`; `OR`.
+**Transitional** operators (`=:`, `>=:` …) are true only on the evaluation where the comparison
+**becomes** true (edge detection) — verified: `LEVEL >=: 80.0` fired for 85 and again for 81
+after 70, not for 90 after 85. `TRUE`/`ON` and `FALSE`/`OFF` are the same.
+
+`IF TRIGGERED BY GROUP|SIGNAL|TIMER|TRIGGER|ALARM|ONCE` tells why the object ran;
+`TRGSIG(sig)`, `TRGTIM(t)`, `TRGALM(a)` name the exact source. A trigger group with interval
+**ONCE** runs the object once when it is created, reset, its class reset, or PROCESS starts —
+good for initialisation (`ENTRYCONDITION TRIGGERED BY ONCE;`).
+
+Format strings for `STRING(x, "fmt")` (§11.7.4): `9` digits, `0` leading zeros, `+` sign,
+`.` decimal point, `EEEE` exponent; dates (seconds since 1970) `D DD DDD M MM MMM Y YY YYYY
+Hh Mm Ss P`; `\` escapes; `%…` C-style (`%5.2f`); empty = `%g`.
+
+## 5. Built-in functions (§6.2, §11.6)
+
+- Maths: `ABS`, `TRUNC`, `SQRT`, `POWER`, `EXP`, `LOG`, `LOG10`, `SIN`/`COS`/`TAN`,
+  `ARC…`, `…HYP`, `RANDOM`.
+- Time: `NOW`, `GMT`, `LCT` (local time), `ADDMONTH`, `DAYS`.
+- Strings/conversion: `LENGTH`, `LEFT`, `MIDDLE`, `RIGHT`, `STRING`, `INTEGER`, `FLOAT`.
+- Trigger info at trigger time: `TRGSIG_VALUE`, `TRGSIG_OLD_VALUE`, `TRGSIG_STATUS`,
+  `TRGSIG_QUALITY`, `TRGSIG_UPDATE_TIME`, limits, `…_STR_VALUE` etc.
+- Signal functions: `SIG_UPDATE(sig, value, status, add)`, `SIG_UPDATE_TIME(…, time)` (sends
+  time to ITM; size its queue), `SIG_OFFLINE(sig, on)`, `SIG_LOCK`, `SIG_FORCE_ALARM_STATE`,
+  `SIG_GETSUB(sig, avg, reset)` (read and reset a sub-item in one step), `SIG_GET_…`/`SIG_SET_…`
+  by attribute id (ids from Yokogawa).
+
+**User functions** (§7): class named `FUNCTIONS` (no objects from it) with
+`FUNCTION [INTEGER|FLOAT|STRING|VOID] name; ARG a FLOAT, …; <CONSTANT/VAR>; <statements>;
+RETURN v; ENDFUNCTION name;`. Max 10 arguments, passed by reference; a user function with a
+built-in's name overrides it.
+
+## 6. Datasets from a class (§12)
+
+- Basic: `DSS_READ_STRING|INTEGER|FLOAT(dataset, record NAME, field, result)` and
+  `DSS_UPDATE_STRING|INTEGER|FLOAT(…)`; `result` 1 = OK.
+- Advanced: `id := DSS_OPEN(dataset, "F1, F2", "rudi", result)` or `DSS_OPEN_ALL`;
+  `DSS_READ_EQUAL(id, name)`, `DSS_READ_NEXT`, `DSS_SET_FILTER` / `DSS_REMOVE_FILTER`,
+  `DSS_GET_…` / `DSS_PUT_…` on the field buffer, then `DSS_UPDATE`, `DSS_INSERT`,
+  `DSS_DELETE`; always `DSS_CLOSE(id)` (otherwise memory leaks). `DSS_ERROR_LOG(on)`.
+- Only STRING, INTEGER, FLOAT data types are supported.
+
+## 7. AGA gas calculations (§13)
+
+`AGA_INIT`, `AGA_COMP` (composition), `AGA_CALC`, `AGA_3_METER`, `AGA_CONE`, `AGA_PULSE`,
+`AGA_8_GROSS`, `AGA_9_…` (ultrasonic), `AGA_R_…` result getters, `AGA_ERROR`. Not practiced;
+see the manual's §13.2 example if needed.
+
+## 8. Examples in the manual (Appendix 1)
+
+`TWIN_UNIT_CONTR` (STEP state machine with timers, transitional operators and limit changes)
+and `SENSOR`/`FLUID_VESSEL` (containment). Reserved words: Appendix 2.
diff --git a/knowledge/manuals/IM36K10P11-01EN.md b/knowledge/manuals/IM36K10P11-01EN.md
new file mode 100644
index 0000000..3ee0b51
--- /dev/null
+++ b/knowledge/manuals/IM36K10P11-01EN.md
@@ -0,0 +1,139 @@
+---
+manual: IM 36K10P11-01EN
+title: Class Description Language - Java
+edition: 3rd Edition, Sep. 2023
+version: R1.03
+status: from docs; a Java class (attachItemToSignal, createItemForSignal with automatic name, Signal.Trigger.VALUE, signalEvent, systemMessage) compiled on quick load and run on the test system with CI-Eng-Sample class CIENG_JFLOW on 2026-09-30; everything else from docs
+---
+
+# Java PROCESS Service language (R1.03)
+
+Summary in own words; section numbers refer to the manual. Engineering: `IM36K10L10-01EN.md`,
+skill `class-object-engineering`. The full API reference is only in the Engineering Module
+class editor (F1).
+
+## 1. What Java adds (§1)
+
+Arrays of signals/attributes, loops, inheritance (`extends` another PROCESS class), any Java
+library (TCP/IP, files, web services), and signals that need not be attached. Java and
+Traditional classes cannot contain each other. Compiled by `OPCJCOM`, created by `OPCJACT`, run
+by `OPCJEXE` (see L10 summary).
+
+## 2. Class layout (§1.1, §3)
+
+```java
+import fasttools.processfast.*;          // the framework; import other packages as usual
+public class CIENG_JFLOW extends ProcessClass {   // name = class name in CLASS_DF, exactly
+    // definitions: class level only, no public/protected modifiers
+    Signal sInflow = defineDoubleSignal(Signal.Trigger.VALUE);
+    Signal sPerMin = defineDoubleSignal();
+    Attribute aCapacity = defineDoubleAttribute(Attribute.Scope.OBJECT);
+    Timer tCheck = defineTimer();
+
+    public void create()  { /* object created: attach or create items */ }
+    public void destroy() { /* object deleted (items are detached automatically) */ }
+    public void start()   { /* object starts: after create and at every CI Server start */ }
+    public void stop()    { /* CI Server stops (not guaranteed, e.g. HA switch) */ }
+    public void signalEvent(Signal signal) { }
+    public void timerEvent(Timer timer) { }
+    public void triggerGroupEvent(TriggerGroup triggerGroup) { }
+}
+```
+
+Naming advice: `s…` signals, `a…` attributes, `t…` timers, `c…` containments, `m…` locals;
+identifiers max 15 characters. Omit methods you do not need.
+
+**Two environments** (§3.4, important): `create()`/`destroy()` run in the *creation*
+environment (`OPCJACT`), everything else in the *runtime* environment (`OPCJEXE`). Signals have
+items only at runtime; timers only at runtime; plain Java fields and objects set in `create()`
+are gone at runtime — only **attributes** carry values across. Static fields are not shared
+between objects of different priorities. Share data through class-scope attributes or items.
+
+## 3. Signals (§4)
+
+- `defineIntegerSignal()`, `defineDoubleSignal()`, `defineStringSignal()` (string max 79
+  characters); `…SignalArray(n)` or `…SignalArray(trigger, n)`; max 4095 signals per class.
+- Triggers: `Signal.Trigger.VALUE | STATUS | OPTION | UPDATE | FIRST | PIT | LIMIT | QUALITY`
+  as argument of `define…Signal()`. Without it the signal never triggers.
+- In `create()`:
+  - `attachItemToSignal(sig, "<item>")` — the item must exist, else creation is cancelled and
+    rolled back.
+  - `createItemForSignal(sig, "<template>[;<station>:<template point>]", "FIELD", value, …)` —
+    any `ITEM_DF` field; `"STORAGE_GROUP", "<group>"` followed by `ITEM_HIS_DF` fields (order
+    matters, max 4 groups); with a point, prefix shared names: `"ITEM'DESCRIPTION"`,
+    `"POINT'DESCRIPTION"`, and use the station's point dataset fields (`STATION`,
+    `IO_ADDRESS` …). Sub-items: template must be a sub-item, main item must exist, name required.
+  - Without `"NAME"` the framework names the item `<object>.<signal identifier>` and creates
+    the sections; **the identifier's case is kept** (verified: `CI-Eng-Sample.TANK1.JFLOW.sPerMin`;
+    item names are case-sensitive for `itmval`). Framework-created items and sections are
+    deleted with the object (verified) unless *Leave items* is set.
+  - `createSection(path, description, process areas, blocked, opcVisible)` creates sections
+    you name yourself; the framework cannot always undo these — prefer automatic names.
+  - Name helpers: `getTag()`, `getSectionsPath()`, `getSections()`, `getFullIdentifierPath(x)`,
+    `getContainerIdentifierName()`, `getContainerIdentifierPath()`, `getNode()`.
+- Unattached signals: `sig.isAttached()`; most methods throw on an unattached signal.
+- Handling: override `signalEvent(Signal signal)` and compare with `==`, or add a named inner
+  class implementing `SignalListener` in `start()` (`addSignalListener`); **anonymous listeners
+  compile but fail at start** (`NoClassDefFoundError` in the log).
+- The signal passed to the handler holds the attribute values of the moment of the trigger.
+- Common methods: `getValueAsDouble/Integer/String()`, `getOldValueAs…()`, `setValue(x)`,
+  `setValueAndStatus(x, Signal.Status.MANUAL)`, `setStatusNumber(Signal.Status.FAILED)`,
+  limits `get/setHighLimit()` … (throw when the item has no such limit — catch it),
+  `isOffline()`, `setOffline()`, `isBlocked()`, `getQuality()`, `getUpdateTime()`,
+  `getValueAsDoubleAndReset()` (sub-items), `setValueAndTime()`.
+- Control item: `hasControlSignal()`, `getControlSignal()`; blocked control item = triggers
+  ignored.
+
+## 4. Attributes (§5)
+
+`defineIntegerAttribute(scope)`, `defineDoubleAttribute(scope)`, `defineStringAttribute(scope)`
+(string max 255), `…AttributeArray(scope, n)`; scope `Attribute.Scope.OBJECT` or `.CLASS`.
+Prompts: `defineStringAttributeForPrompt("Question:")` (always OBJECT scope; max 100 prompts);
+read it in `create()` and call `cancel("message")` to refuse the object (rolls back). Attributes
+survive restarts and are visible in the Engineering Module, but writing them is heavy (disk,
+and for CLASS scope every runtime) — use them for settings, not process values.
+
+## 5. Timers and trigger groups (§6, §7)
+
+- `defineTimer()` (no arrays; not usable in `create()`/`destroy()`); `t.start(10)` or
+  `setTime(10)` + `start()`; `setRepeat(true)`; `cancel()`; resolution 1 s. Handle in
+  `timerEvent()` or with a named `TimerListener`.
+- Trigger groups are assigned in engineering (class or object), not in code; handled in
+  `triggerGroupEvent(tg)` (`tg.getName()`, `tg.getInterval()`, `TriggerGroup.Interval.…`).
+  Use a trigger group for periodic work, a timer for "check again after a while". ONCE groups
+  are unnecessary: use `start()`.
+
+## 6. Containment and inheritance (§8, §9)
+
+- `VALVE cGas = (VALVE)defineContainment("VALVE");` — never `new VALVE()`. Prompts of a
+  contained class become normal attributes: set them in the container's `create()`
+  (`cGas.aStation.setValue(…)`).
+- `create()`/`destroy()` of contained classes are called automatically after the container's
+  (`call(cX).create()` to force order); `start()`/`stop()` and the `…Event()` methods are **not**
+  — call or forward them yourself, or use listeners in the contained class.
+- Inheritance: `public class BOILER_MIXER extends BOILER`; call `super.create()`,
+  `super.signalEvent(signal)` etc.; prompts of the super class are kept. A shared base class
+  (e.g. `BASE_CLASS extends ProcessClass`) holds helper methods; each subclass loads its own
+  copy (no shared statics). Plain Java code can go in a jar in `%TLS_ROOT_PATH%\tls\exe`; its
+  classes must have a package name.
+
+## 7. Runtime behaviour (§10)
+
+- Keep trigger methods short, never sleep: one object holds up all objects **of the same
+  priority** (one thread per priority). Give slow objects their own priority, or extra
+  executors per priority range.
+- Exceptions in `create()` cancel the creation; in a trigger method they abort that trigger and
+  are logged. Use `try/catch`.
+- `systemMessage("text")` writes to the message log (`umhlog.log`, sender `OPCJEXE`, prefixed
+  with the object name — verified); `cancel("text")` also stops the current trigger.
+- `getStatistics()` → processed/lost/queued events, execution times.
+- The manual says a changed class must be compiled **and reset**, and a new class reset before
+  its first object. On the test system a new class compiled by quick load ran its first object
+  without a reset (ISS-029); after changing a class with objects, reset it (skill task
+  `change-reset-class.md`).
+- Release notes (IM 36K01A50): Java classes that use datasets must get the session with
+  `getDssSession()` and never close it.
+
+## 8. Examples in the manual (Appendix 1)
+
+Valve, boiler (containment), twin boiler, mixer boiler (inheritance), city temperature.
diff --git a/knowledge/progress.md b/knowledge/progress.md
index d60664f..85d1caa 100644
--- a/knowledge/progress.md
+++ b/knowledge/progress.md
@@ -30,7 +30,7 @@ AID is not needed.
 | Phase | Manual | Title | Status |
 |---|---|---|---|
 | 0 | IM 36K01A50 | Release Information | summarized ([notes](manuals/IM36K01A50-01EN.md)) |
-| 1 | IM 36K10J10 | System Design/Management | done except migration (phase 6) and debugging tools; skill `system-management` ([notes](manuals/IM36K10J10-01EN.md)) |
+| 1 | IM 36K10J10 | System Design/Management | done except migration (not practiced; needs a second system) and debugging tools; skill `system-management` ([notes](manuals/IM36K10J10-01EN.md)) |
 | 2 | IM 36K01C10 | CI Server Setup | summarized ([notes](manuals/IM36K01C10-01EN.md)); skill `installation-security` |
 | 2 | IM 36K01C30 | Security Guide | summarized ([notes](manuals/IM36K01C30-01EN.md)); skill `installation-security` |
 | 3 | IM 36K10G10 | Tutorial | summarized ([notes](manuals/IM36K10G10-01EN.md)); command-line equivalents practiced on CI-Eng-Sample |
@@ -41,9 +41,9 @@ AID is not needed.
 | 5 | IM 36K10L41 | EQUIPMENT Service - Configuration | summarized ([notes](manuals/IM36K10L41-01EN.md)); general + Modbus in detail, other drivers as a table |
 | 5 | IM 36K10L35 | ITEM Service - ITH | summarized ([notes](manuals/IM36K10L35-01EN.md)); installed processes and setup files checked |
 | 5 | IM 36K10L36 | ITEM Service - ITM | summarized ([notes](manuals/IM36K10L36-01EN.md)); `itmdbg` statistics run; `itmval -f` crashes (ISS-022) |
-| 6 | IM 36K10L10 | Class/Object Engineering | not started |
-| 6 | IM 36K10P10 | Class Description Language - Traditional | not started |
-| 6 | IM 36K10P11 | Class Description Language - Java | not started |
+| 6 | IM 36K10L10 | Class/Object Engineering | done; `opc.sup` read-only, `opcdbg` read-only actions and Reset class practiced ([notes](manuals/IM36K10L10-01EN.md)); skill `class-object-engineering` |
+| 6 | IM 36K10P10 | Class Description Language - Traditional | done for prompts, signals, created items, transitional operators, PRINT/ERROR; timers, alarms, containment, STEP, DSS routines, AGA from docs ([notes](manuals/IM36K10P10-01EN.md)) |
+| 6 | IM 36K10P11 | Class Description Language - Java | done for a basic class (attach/create items, signal trigger, systemMessage); timers, containment, inheritance from docs ([notes](manuals/IM36K10P11-01EN.md)) |
 | 7 | IM 36K10L55 | Exchange Tool Engineering | not started |
 | 7 | IM 36K10L30 | BUS Service | not started |
 | 7 | IM 36K10L45 | Data Access Engineering | not started |
@@ -88,7 +88,7 @@ now come before classes and objects (phase 6), and the other interfaces follow a
 | J10 | Consistency check (`dsschk`, `ismchk`) ([task](../.claude/skills/system-management/tasks/consistency-check.md)) | passed (check); repair and `ismchk` not practiced | n/a | `dsschk -e -v` (check only) reports each of 228 datasets, no problems. Plain `dsschk` prints nothing on a single node. `ismchk` needs a database file name; not run ([ISS-002](issues.md), closed). |
 | J10 | Monitoring processes (`intmon`, `intcpumon`, `intdskmon`, `inttcpmon`, `intspawn`) ([task](../.claude/skills/system-management/tasks/monitoring-processes.md)) | passed | passed | All five worked into `CI-Eng-Sample.SYSTEM.*` / `PUMP1.MODE`, started by hand with `<exe> -n <name>`; setup files restored afterwards. `intdskmon` reports **used** %; `intspawn` command path must be short ([ISS-007](issues.md)). |
 | J10 | Backup of `tls` folders | not practiced | n/a | Plan only; the actual backup tool is site-specific. |
-| J10 | Migration between systems (§5.6) | not practiced | pending | Needs engineered data; revisit after phase 6. |
+| J10 | Migration between systems (§5.6) | not practiced | added | After phase 6 CI-Eng-Sample has every data kind in the chain up to classes/objects (items, points, storage groups, classes, objects). Export with `dssqld -e` works; the import into a second system is not practiced (no second system). |
 | J10 | Tuning checks (read-only) ([task](../.claude/skills/system-management/tasks/tuning-checks.md)) | passed | n/a | Read `dur.sup` (max processes 250), `itm.sup` (item pool 650,000 KB) and the automatic health snapshots `tls\log\smd_*.log` (common memory free, queue use per process, lock collisions). Debug launchers and interactive debuggers not practiced. |
 | C10/C30 | Setup check script `tools/setup_check.ps1` ([task](../.claude/skills/installation-security/tasks/setup-check.md)) | passed | n/a | Read-only; 16 OK / 5 CHECK / 15 DIFF on the Win10 Pro test PC (kept as dev PC by decision). |
 | C10 | Read `ci_start.log` and web ports (`jwuiisg.sup`) | passed | n/a | All services started; SSL error [ISS-008](issues.md). |
@@ -99,7 +99,11 @@ now come before classes and objects (phase 6), and the other interfaces follow a
 | C30 | IT Security Tool, Domain Link Management, account utilities | not practiced | n/a | Not installed and not supported on Windows 10 Pro. |
 | G10 | Sub-items: Integrator, Min-Max (`SUB_ITEM_DF`) ([task](../.claude/skills/item-engineering/tasks/sub-items.md)) | passed | passed | Integrator adds value × seconds; `TIME_UNIT` ignored. |
 | G10 | Block / unblock an item (`ITEM_DF.BLOCKED` via `dssqld -m`); write with `itmval -o` ([task](../.claude/skills/item-engineering/tasks/block-item.md)) | passed | passed | `blk` flag, writes without `-o` silently ignored; `ublk` (*updated blocked*) after unblock ([ISS-001](issues.md), closed). |
-| G10 | Trigger group, class (compile on load), object via quick load ([task](../.claude/skills/class-object-engineering/tasks/load-class-object.md)) | passed | passed | `DEMO.COUNTER` counts every second; full remove/load cycle clean. |
+| G10 | Trigger group, class (compile on load), object via quick load ([task](../.claude/skills/class-object-engineering/tasks/load-class-object.md)) | passed | passed | `DEMO.COUNTER` counts every second; full remove/load cycle clean. Phase 6: three classes and objects in one remove/load cycle, 0 errors. A class that fails to compile is not inserted (`DSI-E-OPCCOMERR`); error lines appear in `LISTING` after insert with `COMPILE` 0 and a compile update (test class removed). |
+| P10/L10 | Traditional class with prompt/attribute, signal from `SECTION`, item created from a template, `ERROR` check, `>=:`, PRINT; attribute change via `OBJECT_ATTR_VAL` ([task](../.claude/skills/class-object-engineering/tasks/traditional-class.md)) | passed | passed | `CIENG_TANK` / `TANK1.CALC`: volume 50→100, 82→164; capacity 0 refused; capacity 200→400 took effect on next run; created item and section deleted with the object. `%` in PRINT cuts the message (ISS-025). |
+| P11 | Java class ([task](../.claude/skills/class-object-engineering/tasks/java-class.md)) | passed | passed | `CIENG_JFLOW` / `TANK1.JFLOW`: inflow 120→2, 90→1.5, `systemMessage` in `umhlog.log` from `OPCJEXE`. Created item keeps the identifier's case (`…JFLOW.sPerMin`). Worked without a class reset (ISS-029). |
+| L10 | Change a class with objects: compile + reset ([task](../.claude/skills/class-object-engineering/tasks/change-reset-class.md)) | passed | passed | Old code runs until reset (`RESET_REQUIRED` 1). `opcdbg` Reset class works (extra prompt for a report file); `dssqld` `CLASS_DF.RESET` does nothing, `OBJECT_DF.RESET` refused (ISS-028). |
+| L10 | `opcdbg` read-only checks ([task](../.claude/skills/class-object-engineering/tasks/opcdbg-checks.md)) | passed | passed | Database check (one never-compiled foreign class `SINUS`), get class/object, object status/signals/attributes, executor main info. Dumps are not `dssqld`-readable (ISS-027). |
 | G10/C10 | Authorization group and user creation ([task](../.claude/skills/authorization/tasks/users-groups.md)) | passed | passed | Group `CIENG_VIEWER` (sample file `08_auth_group_df.qli`) loaded/removed by Claude; test user `CIENG_TEST` (no password) loaded by the user, checked and removed. The sample creates no users. |
 | C10 | String items: length 1–200, holds length − 1 characters ([task](../.claude/skills/item-engineering/tasks/string-items.md)) | passed | passed | Tested with temporary `CI-Eng-Sample.DEMO.STR*` items (removed): 201 rejected; too-long writes cut, status 12 OVERRANGED ([ISS-019](issues.md)). |
 | C10 | Integrator time unit: integration granule `itm_int_secs` in `itm.sup` ([task](../.claude/skills/item-engineering/tasks/sub-items.md)) | passed | passed | 60 → `RUN_SECONDS` +1 per minute; restored to 1 (file identical to backup), +1 per second again ([ISS-010](issues.md)). Elevated restarts run by the user. |