| Axis |
A scale from domain values (numbers, timestamps, categories, angles) to canvas distance along one direction. |
| Band |
One category of an ordinal axis, drawn as a lane, row or column. |
| Bindable |
A property that accepts a literal or a dynamic value (cel, attribute, token, param). |
| Bound placement |
A coordinate read from and written to a model attribute. |
| Budget |
A hard limit on how much of a model a view draws, with what is withheld while it is reached (3.2.1). |
| Canvas units |
Rendering units at zoom 1; pixels for the default axis. |
| CEL |
Common Expression Language, the only expression language of DISL. |
| Compartment |
A stacked region inside a node listing items. |
| Context (CEL) |
The set of variables available to an expression, determined by where it appears. |
| Derived element |
An element computed from other elements of the model, never stored or written (4.11). |
| DID definition |
A diagram a user created of a diagram type, stored as a .did file (DID, the Diagram Definition Language). |
| Document |
The content a user works on in a host; for a diagram, its stored form is a DID definition. |
| Domain value |
A position in the units of its axis: a number, a timestamp or a band reference. |
| Ephemeral id |
An id that identifies an element within one reading of the model only; nothing is stored keyed by it (11.5.3). |
| Finding |
The result of a rule or of reading a model: a severity, a message and what it is about (8.6). |
| Gesture constraint |
A constraint evaluated before a user action is applied (connect, contain, create, delete, place, change). |
| Handle |
An interactive point on a shape that edits a shape parameter. |
| Invariant |
A constraint on the current state of the diagram. |
| Marker |
A decoration at an edge end or along an edge, such as an arrowhead. |
| Message |
A text a runtime shows to users: a LocalizedText or a CEL value returning one (2.3). |
| Metamodel |
The abstract syntax: types, attributes, relations, containment and ports. |
| Notation |
The concrete syntax: shapes, styles, labels and markers. |
| Plugin |
Named, declared, versioned code that extends a runtime. |
| Port |
A named connection point on a node. |
| Reason |
Why something is refused, read-only or unavailable: a Message, a conditional Message or a named reason (2.3). |
| Runtime |
Software in a host that loads a specification and lets users create and change DID definitions with it. |
| Specification |
A DISL file (.dis) in which a tool engineer specifies one diagram type. |
| Tool engineer |
The person who specifies a diagram type in DISL. |
| Snap rule |
A function mapping a raw domain value to an allowed value on one axis. |
| Token |
A named theme value (a color, font or size), resolved per theme mode. |
| Transaction |
An atomic, undoable unit of change. |
| Variant |
An alternative notation applied when a condition holds. |
| View data |
Per-diagram placement and presentation data stored separately from the model. |
| Viewer state |
View data that belongs to one viewer (folds, filters, the variant shown): never stored, never undone (11.6). |
| View-only element |
An element that exists only in a view (a note or frame) and has no model meaning. |
| Viewpoint |
A kind of diagram over the model, with its own types, coordinates, toolbox and layout. |
