Class

• <DRM Property Set Table Group>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class specifies an interchangeable group of one or more <DRM Property Set Table> instances. The primary <DRM Property Set Table> component of the group is indicated by the primary_table_index. When a reference is made to a <DRM Property Set Table> instance (for example, from a <DRM Property Set Index> component of a <DRM Polygon> instance), the reference identifies the <DRM Property Set Table Group> instance and the index within the <DRM Property Set Table> instance, but not the specific <DRM Property Set Table> component of the <DRM Property Set Table Group> instance. By definition, a <DRM Property Set Index> instance refers to a <DRM Property Set> component of the primary <DRM Property Set Table> component of the indicated <DRM Property Set Table Group> instance. An alternate <DRM Property Set Table> instance from within the <DRM Property Set Table Group> instance can be chosen at the discretion of the data consumer.

The primary_table_index specifies the primary <DRM Property Set Table> component from the ordered <DRM Property Set Table> components of the <DRM Property Set Table Group> instance.

The table_size field specifies the size of each <DRM Property Set Table> component of the <DRM Property Set Table Group> instance.

Class diagram

Figure 6.242 — DRM_Property_Set_Table_Group

Constraints

• <DRM Property Set Table> size
• Publishable object

Example(s)

• Consider a transmittal containing a <DRM Property Set Table Library> instance with only one <DRM Property Set Table Group> component, which in turn has only one <DRM Property Set Table> component. That <DRM Property Set Table> instance is the one and only <DRM Property Set Table> instance for the entire transmittal.

• A <DRM Property Set Table Group> instance contains two <DRM Property Set Table> components: one for normal, OTW viewing and the other to change the appearance of the view to be a view as seen through night vision goggles.

• A data provider is required to provide three alternate tables of properties, in this example colours and textures, for a particular set of environmental data. A <DRM Property Set Table Group> instance with three <DRM Property Set Table> components with the same usage of OTW is provided. One <DRM Property Set Table> component defines the colours and textures as originally created by the data modellers. The second <DRM Property Set Table> component has different shades of blue for the lakes and skies that are preferred by one set of customers. The third <DRM Property Set Table> component contains yet another set of blues for the lakes, different textures for the lakes and different shades of green for the trees preferred by a different set of customers. The data provider identifies the first <DRM Property Set Table> component as the primary <DRM Property Set Table> component for the group.