| Enumerant | Definition | Value |
|---|
| SE_FTL_ZERO |
Topology level ZERO.
The following DRM objects and relationships shall exist:
DRM objects:
a. <Feature Node> - one or more instances.
b. <Feature Edge> - required if any <Feature Face> instances
exist
Relationships:
a. A two-way association between <Feature Node> instances and
<Feature Edge> instances:
1. shall exist for each <Feature Edge> instance that is
connected to a given <Feature Node> instance; and
2. shall exist for each of the two <Feature Node> instances
(starting node and ending node) that bound each
<Feature Edge> instance.
Constraints:
No additional constraints are required.
Other types of feature topology DRM objects and relationships
may exist at level SE_FTL_ZERO, but are not required. The
requirements of level SE_FTL_ONE shall not be met. Thus,
there shall be at least one pair of collocated <Feature Node>
instances.
|
1 |
| SE_FTL_ONE |
Topology level ONE.
No additional types of DRM objects or relationships are required.
Constraints:
a. Each <Feature Node> instance shall have a <Location> instance
with unique coordinates. That is, no two <Feature Node>
instances may be collocated.
The requirements of level TWO shall not be met. That is, at least
one pair of intersecting <Feature Edge> instances must exist.
|
2 |
| SE_FTL_TWO |
Topology level TWO.
No additional types of DRM objects or relationships are required.
Constraints:
a. <Feature Edge> instances may not intersect or overlap one
another, except where they meet at a common <Feature Node>
instance.
The requirements of level THREE shall not be met.
|
3 |
| SE_FTL_THREE |
Topology level THREE.
The following DRM objects and relationships are required to exist,
in addition to the requirements of topology level TWO.
DRM objects:
a. <Feature Face> - one or more instances, and
b. <Feature Face Ring> - one or more instances for each
<Feature Face> instance
Relationships:
a. A two-way association between <Feature Node> instances and
<Feature Face> instances shall exist for each <Feature Node>
instance located in the interior of a <Feature Face> instance.
b. A one-way association from <Feature Edge> instances to
<Feature Face> instances shall exist for each of the
<Feature Face> instances that each <Feature Edge> instance
bounds.
c. A one-way association from <Feature Face Ring> instances to
<Feature Edge> instances shall exist for each of the
<Feature Edge> instances that bound a <Feature Face> instance.
Constraints:
a. <Feature Face> instances may not intersect or overlap one
another, except where they meet at a common <Feature Edge>
instance.
b. The set of <Feature Face> instances shall be exclusive and
exhaustive, forming a complete topological surface.
c. Each <Feature Edge> instance shall bound exactly two
<Feature Face> instances.
d. Exactly one <Feature Face> instance within the parent
<Union Of Feature Topology> instance shall have its
universal field set to SE_TRUE. All other <Feature Face>
instances within the parent <Union Of Feature Topology>
instance shall have their universal fields set to SE_FALSE.
|
4 |
| SE_FTL_FOUR |
Topology level FOUR.
No additional types of DRM objects or relationships are required.
Constraints:
a. <Location 3D> instances are required for all coordinates.
b. Each <Feature Edge> instance may bound zero or more
<Feature Face> instances. (This overrides the level THREE
constraint.)
c. At least one <Feature Edge> instance shall bound more than
two <Feature Face> instances.
|
5 |
| SE_FTL_FIVE |
Topology level FIVE.
The following DRM objects and relationships are required to exist,
in addition to the requirements of topology level FOUR:
DRM objects:
a. <Feature Volume> - one or more instances, and
b. <Feature Volume Shell> - one or more instances for each
<Feature Volume> instance
Relationships:
a. A two-way association between <Feature Node> instances and
<Feature Volume> instances shall exist for each <Feature Node>
instance located in the interior of a <Feature Volume> instance.
b. A two-way association between <Feature Edge> instances and
<Feature Volume> instances shall exist for each <Feature Edge>
instance completely located in the interior of a
<Feature Volume> instance.
c. A one-way association from <Feature Face> instances to
<Feature Volume> instances shall exist for each of the two
<Feature Volume> instances that each <Feature Face> instance
bounds.
d. A one-way association from <Feature Volume Shell> instances
to <Feature Face> instances shall exist for each of the
<Feature Face> instances that bound a <Feature Volume> instance.
Constraints:
a. <Feature Volume> instances may not intersect or overlap
one another, except where they meet at a common <Feature Face>
instance.
b. The set of <Feature Volume> instances shall be exclusive and
exhaustive, forming a complete topological space.
c. Exactly one <Feature Volume> instance within the parent
<Union Of Feature Topology> instance shall have its
universal field set to SE_TRUE. All other <Feature Volume>
instances within the parent <Union Of Feature Topology>
instance shall have their universal fields set to SE_FALSE.
All <Feature Face> instances within the parent
<Union Of Feature Topology> instance shall have their
universal fields set to SE_FALSE.
|
6 |