Table 6.103 — DRM_Hierarchy_Summary_Item

Property

Description

Class

  • <DRM Hierarchy Summary Item>

Superclass

Subclass

  • None.

Definition

An instance of this DRM class represents an instance, or a number of identical instances, of a <DRM Geometry Hierarchy> instance or <DRM Feature Hierarchy> instance that exists within the given <DRM Model> instance or <DRM Environment Root> instance. <DRM Hierarchy Summary Item> instances are combined together to form hierarchies that mirror those that they summarize. This summary is a compressed form of the actual hierarchy, as each <DRM Hierarchy Summary Item> instance may represent a number of instances of the class indicated by its drm_class field.

The multiplicity field records how many instances of the given class a <DRM Hierarchy Summary Item> instance actually represents. All instances represented by one <DRM Hierarchy Summary Item> instance shall have exactly the same hierarchical pattern beneath them, right down to where the hierarchy summary concludes. A <DRM Hierarchy Summary Item> instance represents both the instance(s) that it describes, and the specific hierarchy beneath it. It may have an optional association to the <DRM Geometry Hierarchy> instance(s) or <DRM Feature Hierarchy> instance(s) that it summarizes.

Each <DRM Hierarchy Summary Item> instance can optionally have a list of <DRM EDCS Use Summary Item> components giving the classifications that are attached to those instances in the transmittal being summarized.

The hierarchy summary does not have to be a total representation of the entire transmittal hierarchy and can be limited to a useful high level summary. If the producer of the transmittal being summarized deems it of potential use to consumers, the branches of the hierarchy summary can terminate with a list of <DRM DRM Class Summary Item> components representing the DRM objects beneath that point in the hierarchy.

The multiplicity_meaning field specifies the meaning of the multiplicity field value for the <DRM Hierarchy Summary Item> instance.

The multiplicity field specifies the number of identical instances represented, or the order of magnitude of that number, for the <DRM Hierarchy Summary Item> instance. If the multiplicity is unknown, the value of this field shall be set to zero.

Class diagram

Figure 6.122 — DRM_Hierarchy_Summary_Item

Inherited field elements

Field name

Range

Field data type

drm_class

 

DRM_Class

Field elements

Field name

Range

Field data type

multiplicity_meaning

 

Hierarchy_Summary_Multiplicity_Code

multiplicity

 

Integer_Unsigned

Default field values

Default field values for DRM_Hierarchy_Summary_Item

Associated to (one-way) (inherited)

  • None.

Associated to (one-way)

Associated by (one-way) (inherited)

  • None.

Associated by (one-way)

  • None.

Associated with (two-way) (inherited)

  • None.

Associated with (two-way)

  • None.

Composed of (two-way) (inherited)

  • None.

Composed of (two-way)

Composed of (two-way metadata) (inherited)

Composed of (two-way metadata)

  • None.

Component of (two-way) (inherited)

  • None.

Component of (two-way)

Constraints

Clarifications

1If present, the association(s) to <DRM Feature Hierarchy> instances indicate that the <DRM Hierarchy Summary Item> instance summarizes the specific <DRM Feature Hierarchy> object tree(s) thus indicated.

2If present, the association(s) to <DRM Geometry Hierarchy> instances indicate that the <DRM Hierarchy Summary Item> instance summarizes the specific <DRM Geometry Hierarchy> object tree(s) thus indicated.

3If present, the <DRM DRM Class Summary Item> components of a <DRM Hierarchy Summary Item> instance list classes for which instances occur beneath this point in the hierarchy being summarized.

4If present, the <DRM Hierarchy Summary Item> components of a <DRM Hierarchy Summary Item> instance summarize the next level down in the component tree of the hierarchy being summarized.

5If present, the list of <DRM EDCS Use Summary Item> components of a <DRM Base Summary Item> instance summarize EDCS usage by instances of the class specified by drm_class that occur somewhere in the scope being summarized.

Example(s)