The SEDRIS Data Representation Model
APPENDIX A - Classes
State Related Features
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Class Name: State Related Features
Subclasses
This DRM class is concrete and has no subclasses.
Definition
A mechanism for specifying discrete states from a possibly continuous
state value. Each discrete state corresponds to a branch of the
<State Related Features> and is
identified by the <State Data> for
that branch; the state value itself is given by the
state_tag
of <State Related Features>.
Primary Page in DRM Diagram:
Secondary Pages in DRM Diagram:
This class appears on only one page of the DRM class diagram.
Example
Consider a <Feature Model> representing
a road in various states of damage - in this example, after flooding.
The road's topological connections are different in various states
of damage, due to bridges being washed away and various road segments
being blocked due to fallen trees and the like.
Consequently, the <Feature Model>
consists of a State Related Features
instance, with state_tag =
EAC_GENERAL_DAMAGE_FRACTION
and active_state
= 0.0 % (that is, initially the road is undamaged, before flooding
takes place).
The <State Data> for each branch
indicates the range
of percent damage for which that branch describes the
road's feature topology.
FAQs
- Is <State Related Features>
the only way to represent multi-state objects in SEDRIS?
No. <Control Link> instances can be used to
provide a fine level of control
over state by changing fields instead of representing states
as different <Feature> instances.
Constraints
Associated by (one-way)(inherited)
Associated with (two-way)(inherited)
Composed of (two-way)(inherited)
Composed of (two-way)
Composed of (two-way metadata)(inherited)
Component of (two-way)(inherited)
Notes
Associated with Notes
An association between two <Feature> instances indicates
that they are alternate representations of the same
environmental object.
An association between a <Geometry Hierarchy> instance and a
<Feature> instance indicates that the <Geometry Hierarchy>
and the <Feature> are alternate representations of the same
environmental object.
An association between a <Property Grid> instance and a
<Feature> instance indicates that the <Feature> and the <Property Grid>
(or some specific cell data within that <Property Grid>) are
alternate representations of the same environmental object.
Each associated <Property Grid> will indicate which is the case.
Composed of Notes
This relationship exists to support "attributes for derived objects."
That is, these components are used only to specify texture mapping
information for geometry that is to be derived from the
<Aggregate Feature> by the consumer. These <Image Mapping Function>
instances shall use <Image Anchor> components to specify the mapping.
This is needed for cases in which an <Aggregate Feature> is
significant only for a particular domain, such as radar.
Fields Notes
If this value is SE_TRUE, each 'descendant' of this aggregation -
that is, each <Feature> instance that exists in the component tree
rooted at the given <Aggregate Feature> - shall be unique, in the
sense that it shall appear in only one 'branch' of this aggregation.
If unique_descendants is SE_FALSE, at least one <Feature> instance
appears in more than one 'branch' of the aggregation.
If this value is SE_TRUE, each 'branch' of this aggregation
strictly complies with the organizing principle for its
particular subclass. If this value is SE_FALSE, at least
one 'branch' does not strictly comply with the given
organizing principle. See the organizing principle constraint
for each specific subclass for details.
This is the state by which the component <Feature Hierarchy> instances
are being differentiated, and shall be an EAC which is designated
as "state applicable".
This is the default state. If the given <State Related Features>
instance has a <State Control Link>, this field is the target
of that <State Control Link>.
Prev: State Data.
Next: State Related Geometry.
Up:Index.
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Last updated: May 15, 2003
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Copyright © 2003 SEDRIS™
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