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Document Composer

The Document Composer lets you author formal government decision documents (beschikkingen) as structured templates inside the Linked Data Explorer. Templates are zone-based, block-driven, and bound to Operaton process variables — so a document authored here can be rendered at runtime by MijnOmgeving for any completed process instance.

Screenshot: Document Composer three-panel layout — document list on the left, zone canvas in the centre, and the Bindings panel on the right with the Kapvergunning Beschikking example open

Document Composer: document list (left), zone canvas (centre), Bindings panel (right)

Three-panel layout

The Composer uses the same three-panel layout convention as the BPMN Modeler and Chain Builder.

  • Left panel — Document list. Shows all documents stored in localStorage with create, rename, delete, and Save as… actions. An EXAMPLE badge marks the read-only seed document; user-created documents carry a WIP badge.
  • Centre panel — Zone canvas. Renders the document zones in A4-style layout. Blocks are dragged onto zones from the left panel's Content library, and can be reordered or moved between zones by dragging.
  • Right panel — Bindings. Links {{placeholder}} tokens in rich-text blocks to Operaton process variable keys. Only visible when a document is active.

Document zones

Every document follows a fixed zone structure that matches Dutch administrative letter conventions:

Zone Label Required Purpose
letterhead Letterhead Yes Logo, organisation name, house style elements
contactInformation Contact Information Yes Address, phone, email, website
reference Reference Yes File number, date, subject, case handler
body Body Yes Decision, motivation, considerations (Awb art. 3:46)
closing Closing Yes Appeal options, deadlines, next steps
signOff Sign-off Yes Name, role, signature of signatory
annex Annex No Optional annexes; toggled via Add annex / Remove annex

The Letterhead and Contact Information zones render side-by-side at the top of the canvas to reflect standard letter layout.

Block types

The Content library in the left panel provides five block types that can be dragged onto any zone:

Block Icon Description
Rich text T TipTap editor with bold, italic, headings (H1–H3), and lists. Supports {{placeholder}} tokens for variable interpolation.
Variable {} Standalone display of a single Operaton process variable value.
Image 🖼 Fetches and renders an asset from the active TriplyDB dataset.
Separator — Horizontal rule for visual separation between sections.
Spacer ↕ Vertical whitespace block for layout control.

Blocks can be reordered within a zone by dragging, or moved to a different zone by dragging across zone boundaries.

Variable Bindings panel

Screenshot: Bindings panel showing the process key field, Discover Variables button, discovered variable chips with type labels, and a filled binding form

Bindings panel: process key, discovered variable chips, and the manual binding form

The Bindings panel maps {{placeholder}} tokens in document text to Operaton process variable keys.

Discover Variables — enter a process definition key (e.g. AwbShellProcess) and click the button to query the Operaton history API for all variables used by completed instances of that process. Discovered variables appear as clickable chips labelled with their type (String, Boolean, Double, etc.). Clicking a chip pre-fills the binding form.

Each binding records:

Field Description
Placeholder {{variableName}} token used in rich-text blocks
Variable key Operaton process variable name
Source process (live variable) or dmn_output (DMN result variable)
Label Optional human-readable label for the binding panel

Storage

Document templates are stored in PostgreSQL via the LDE backend, cached locally in localStorage for instant synchronous access. On editor load, the service fetches the authoritative list from GET /v1/assets/documents and replaces the local cache.

Example templates (readonly: true) are seeded from defaultTemplates.ts on the frontend and are never written to the database.

See Asset Storage for the full architecture.

BPMN Modeler integration

A Link decision template selector is injected into the BPMN properties panel for every UserTask element. Selecting a document template writes camunda:documentRef to the BPMN XML. A purple badge appears below the element on the canvas, distinct from the green form badge (📝) and the amber DMN badge.

Screenshot: BPMN canvas showing a UserTask with all three badges: amber DMN badge, green form badge, and purple document badge stacked below the element

UserTask with DMN (amber), form (green), and document template (purple) badges

See BPMN Modeler — Document template linking for details.