How to define properties and enumerations

Add a property to an element type

1. Select the M2 element type in the Explorer
2. In the Properties panel, find the properties section
3. Click to add a new property
4. Set the name (e.g., “Lifecycle Status”)
5. Set the data type — String, Integer, Real, Boolean, Date, DateTime, or an enumeration
6. Set the multiplicity — 1..1 (required) or 0..1 (optional)
7. Optionally set a default value

The property now appears on all M1 instances of this element type.

Create an enumeration

1. Right-click the Enumerations package in your metamodel
2. Select New Enumeration
3. Rename it (e.g., “System Status”)
4. In the Properties panel, add literal values:
   • Each literal has a name (display label) and a value (stored value)
   • Example: Name = “Active”, Value = “active”

Use an enumeration as a property type

When adding a property to an element type, select your enumeration from the type picker. It appears alongside the primitive types. The property renders as a dropdown in the Properties panel and in catalogs.

Add format hints to string properties

String properties support format hints that change how they’re displayed:

Hint	Effect
multiline	Renders as a textarea
url	Renders as a clickable link
email	Renders as a clickable mailto link

Add properties to relationship types

The process is identical — select a relationship type and add properties in the same way. Relationship properties appear in the Properties panel when an edge is selected.