Class

• <DRM Property Set>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class groups together a set of instances of classes that

• have formal component relationships with <DRM Geometry> and / or <DRM Feature>, and
• that specify either 'attributes', such as <DRM Rendering Priority Level>, or metadata.

An <DRM Property Set> instance provides a mechanism for a set of 'attributes' to be explicitly reused by many <DRM Geometry> and / or <DRM Feature> instances.

Class diagram

Figure 6.224 — DRM_Property_Set

Constraints

• No attribute conflicts
• Property Set components
• Publishable Object

Example(s)

• A number of <DRM Polygon> instances that are all coloured red and rendered using flat shading each contain the same <DRM Property Set Index>, which references an <DRM Property Set> containing a <DRM Colour> instance specifying red and a <DRM Rendering Properties> instance specifying flat shading.

• A number of <DRM Polygon> instances that are all coloured green, have grass texture that is modulated and have an EAC_SURFACE_MATERIAL_TYPE specifying EEC_SRF_MATTY_GRASS. A common <DRM Property Set Index> specifies an <DRM Property Set> containing:

  1. a <DRM Colour> instance specifying green,

  2. an <DRM Image Mapping Function> instance specifying image_mapping_method = MODULATE, and

  3. a <DRM Property Value> instance specifying an EAC_SURFACE_MATERIAL_TYPE value of EEC_SRF_MATTY_GRASS.

• A number of <DRM Polygon> instances that all have the same electromagnetic properties and are coloured grey. A common <DRM Property Set> would contain a <DRM Colour> instance specifying grey and a <DRM Property Table Reference> into a <DRM Property Table> of electromagnetic properties.

• A <DRM Feature> is associated with a <DRM Geometry> that has been developed from it. Both reference the same <DRM Property Set>, which contains a <DRM Colour> instance, <DRM Image Mapping Function> and <DRM Browse Media>. The <DRM Geometry> would use the <DRM Colour> and <DRM Image Mapping Function> but ignore the <DRM Browse Media>.

• Consider a <DRM Feature> instance with a <DRM Data Quality> component, the fictional field of which is set to TRUE. This particular <DRM Feature> instance also has an <DRM Property Set Index> component, referencing an <DRM Property Set> containing a <DRM Data Quality> instance, the fictional field of which is set to FALSE. Since a <DRM Feature> may contain at most one <DRM Data Quality> instance, the <DRM Data Quality> instance with fictional set to TRUE would be used, as it is contained directly by the <DRM Feature> instance.

• Consider a <DRM Geometry> instance with two <DRM Property Table Reference> components, which references an <DRM Property Set> that contains another three <DRM Property Table Reference> instances, where all 5 have distinct meanings. As a <DRM Geometry> may contain many <DRM Property Table Reference> instances, all five will be used by the <DRM Geometry> as required. The two that are contained directly will be used first, then the three that are contained in the <DRM Property Set>.

• Consider a <DRM Polygon> instance with two <DRM Image Mapping Function> components, which references an <DRM Property Set> that contains another two. As a <DRM Primitive Geometry> may contain many ordered <DRM Image Mapping Function> instances, all four will be used by the <DRM Polygon> as required. The two that are contained directly will be used in order first, then the three that are contained in the <DRM Property Set>, again in order.

• A <DRM Union Of Primitive Geometry> contains two <DRM Property Table Reference> instances and references two <DRM Property Set> instances. The first <DRM Property Set> contains another <DRM Property Table Reference> and and the second <DRM Property Set> contains another three <DRM Property Table Reference> instances. As an <DRM Aggregate Geometry> may contain many <DRM Property Table Reference> instances, all six would be used by the <DRM Union Of Primitive Geometry> as required. The two that are contained directly would be used first, then the one that is contained in the first <DRM Property Set> and finally the three that are contained in the second <DRM Property Set>.