Class Name: Colour Table

Superclass - <SEDRIS Abstract Base>

Subclasses

Definition

An instance T of this DRM class specifies an ordered collection of <Primitive Colour> instances such that, for the <Colour Table Group> instance G of which T is itself a component, the index field of any <Colour Index> instance associated to G unambiguously specifies one of the <Primitive Colour> components of T.

Primary Page in DRM Diagram:

• 14

Secondary Pages in DRM Diagram:

Example

1. Consider a data provider whose format specifies colours using palettes. To convey exactly the colour information used, each palette is represented as the primary <Colour Table> component of a <Colour Table Group> instance.

FAQs

Why do <Colour Table> instances have <Primitive Colour> rather than <Inline Colour> components?

A <Colour Table> instance does not contain <Inline Colour> components, because a <Colour Table> exists to store "just the colour", without any additional <Translucency>.

1. The interpretation of a <Colour Index> is clearer if the referenced <Colour Table> entry cannot have additional <Translucency>.

2. Storing <Primitive Colour> instances in a <Colour Table> allows greater re-use, since the same <Primitive Colour> can be referenced by different <Colour Index> instances with different <Translucency> components.

Constraints

• <<Publishable Object>>
• <<Colour Table Size>>

Composed of (two-way)

• zero or one <Presentation Domain> instance
• one or more {ordered} <Primitive Colour> instances

Composed of (two-way metadata)

• zero or one <Identification> instance

Component of (two-way)

• one <Colour Table Group> instance

Inherited Field Elements