Class

• <DRM Property Set Index Control Link>

Superclass

• <DRM Control Link>

Subclass

• None.

Definition

An instance of this DRM class specifies a <DRM Expression> instance that determines the index field value of all target <DRM Property Set Index> instances, thus controlling which <DRM Property Set> instance is referenced by each such <DRM Property Set Index> instance.

NOTE  Since each controlled <DRM Property Set Index> instance may be bound to a different <DRM Property Set Table Group> instance, and thus to a different primary <DRM Property Set Table> instance, the fact that their index values are the same does not mean that the set of <DRM Property Set Index> instances controlled by a given <DRM Property Set Index Control Link> instance reference the same <DRM Property Set> instance.

The expression_index field specifies the <DRM Expression> component, the value of which controls the index of the affected <DRM Property Set Index> instances.

Class diagram

Figure 6.240 — DRM_Property_Set_Index_Control_Link

Constraints

• <DRM Control Link> constraints
• Publishable object

Example(s)

• A tree canopy appears different at different times of the year, with a different colour and texture. This can be achieved by using a different <DRM Property Set> instance for each period of the year. Each <DRM Property Set> instance contains the appropriate <DRM Colour> instance(s) and <DRM Image Mapping Function> instance(s). A <DRM Property Set Index Control Link> instance is used to allow the appropriate <DRM Property Set> instance to be selected.