The SEDRIS Data Representation Model
APPENDIX B - Constraints
Attribute Set Components
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Definition
An <Attribute Set> may contain attribute objects
used by <Geometry> and / or
<Feature> instances. If it contains attribute objects
that are used by <Geometry> and is referenced by a
<Feature>, the
<Geometry>-related attribute objects are ignored. The
reverse is also true.
Rationale
This allows <Geometry> and
<Features> to use the same
<Attribute Set>. This may be desirable if they
share some of the same attribute objects; for example, if the
<Geometry> is actually an alternate representation of
the <Feature>.
Example
- A <Linear Feature> is associated with a
<Union Of Primitive Geometry> that
has been derived from it. Both reference the same
<Attribute Set> that contains an
<Inline Colour>,
<Light Rendering Properties>, and
<Browse Media>. The
<Linear Feature> uses the
<Inline Colour> and
<Browse Media> instances, but ignores the
<Light Rendering Properties>. The
<Union Of Primitive Geometry> uses
the <Inline Colour> and
<Light Rendering Properties>, but
ignores the <Browse Media>.
FAQs
No FAQs supplied.
Next: Attribute Set Table Size.
Up:Index.
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Last updated: October 1, 2002
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Copyright © 2002 SEDRIS™
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