When you define a class for a tool information model, you specify the interfaces that the class implements. For each of those interfaces, you specify the members (properties, methods, and collections) that are attached to the interface.
In order to attach a property to an interface, a property definition must exist for the property. The characteristics of the property (its name, dispatch identifier, data type, and various storage details) are stored in the property definition object. These characteristics are defined by the properties of the property definition object.
To create a new property definition
A PropertyDef object is also a RepositoryObject object. In addition to the members described here, PropertyDef objects also provide the members that are defined for repository objects.
Use the PropertyDef object to retrieve or modify the characteristics of a property definition, or to determine which interface exposes a particular property.
| Property | Description |
| APIType | The C data type of the property. |
| ColumnName | The name of the column in the SQL table for this property. |
| DispatchID | The dispatch identifier to use when accessing an instance of this type of property. |
| Flags | Flags that specify details about this property definition. |
| SQLScale | The number of digits to the right of the decimal point for a numeric property. |
| SQLSize | The size in bytes of the property. |
| SQLType | The SQL data type of the property. |
| Collection | Description |
| Interface | The interface to which this property definition is attached. |
| Properties | The collection of all persistent properties that are attached to the PropertyDef object. |