| Enumerant | Definition | Value |
|---|
| SE_FEAT_TOPO_LVL_ZERO |
Topology level 0.
The following SEDRIS objects, and relationships among those
SEDRIS objects, are required to exist:
SEDRIS Objects:
<Feature Node> - one or more instances.
<Feature Edge> - required if any <Feature Face> instances
exist
Relationships:
<Feature Node> <-> <Feature Edge> association -
- required for each <Feature Edge> instance that is connected
to a given <Feature Node> instance
- required 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 objects and relationships MAY
exist at level 0, but are not required.
The requirements of level 1 must NOT be met (that is, there must be
at least one pair of collocated <Feature Node> instances).
|
1 |
| SE_FEAT_TOPO_LVL_ONE |
Topology level 1.
Objects and Relationships:
No additional types of SEDRIS objects or relationships are required.
Constraints:
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 2 must NOT be met; that is, at least
one pair of intersecting <Feature Edge> instances must exist.
|
2 |
| SE_FEAT_TOPO_LVL_TWO |
Topology level 2.
Objects and Relationships:
No additional types of SEDRIS objects or relationships are required.
Constraints:
<Feature Edge> instances may not intersect or overlap one
another, except where they meet at a common <Feature Node>
instance.
The requirements of level 3 must NOT be met.
|
3 |
| SE_FEAT_TOPO_LVL_THREE |
Topology level 3.
The following objects and relationships are required to exist, in
addition to the requirements of topology level 2.
Objects:
<Feature Face> - one or more instances
<Feature Face Ring> - one or more for each <Feature Face>
instance
Relationships:
<Feature Node> <-> <Feature Face> association - required for
each <Feature Node> instance located in the interior of a
<Feature Face> instance
<Feature Edge> -> <Feature Face> association - required for
each of the <Feature Face> instances each <Feature Edge>
instance bounds
<Feature Face Ring> -> <Feature Edge> association - required for
each of the <Feature Edge> instances that each <Feature Face>
instance is bounded by
Constraints:
<Feature Face> instances may not intersect or overlap one another,
except where they meet at a common <Feature Edge>.
The set of <Feature Face> instances must be exclusive and
exhaustive, forming a complete topological surface.
Each <Feature Edge> instance must bound exactly two
<Feature Face> instances.
Exactly one <Feature Face> instance within the parent
<Union Of Feature Topology> shall have its universal field
set to SE_TRUE. All other <Feature Face> instances within
the parent <Union Of Feature Topology> shall have their
universal fields set to SE_FALSE.
|
4 |
| SE_FEAT_TOPO_LVL_FOUR |
Topology level 4.
Objects and Relationships:
No additional types of objects or relationships are required.
Constraints:
<Location 3D> instances are required for all coordinates.
Each <Feature Edge> instance may bound zero or more
<Feature Face> instances. (This overrides the level 3
constraint.)
At least one <Feature Edge> instance must bound more than two
<Feature Face> instances.
|
5 |
| SE_FEAT_TOPO_LVL_FIVE |
Topology level 5.
The following objects and relationships are required to exist, in
addition to the requirements of topology level 4:
Objects:
<Feature Volume> - one or more instances
<Feature Volume Shell> - one or more for each <Feature Volume>
instance
Relationships:
<Feature Node> <-> <Feature Volume> association - required
for each <Feature Node> instance located in the interior
of a <Feature Volume> instance
<Feature Edge> <-> <Feature Volume> association - required
for each <Feature Edge> instance completely located in the
interior of a <Feature Volume> instance
<Feature Face> -> <Feature Volume> association - required for
each of the two <Feature Volume> instances that each
<Feature Face> instance bounds
<Feature Volume Shell> -> <Feature Face> association - required
for each of the <Feature Face> instances that each
<Feature Volume> instance is bounded by
Constraints:
<Feature Volume> instances may not intersect or overlap
one another, except where they meet at a common <Feature Face>.
The set of <Feature Volume> instances must be exclusive and
exhaustive, forming a complete topological space.
Exactly one <Feature Volume> instance within the parent
<Union Of Feature Topology> shall have its universal field
set to SE_TRUE. All other <Feature Volume> instances within
the parent <Union Of Feature Topology> shall have their
universal fields set to SE_FALSE. All <Feature Face> instances
within the parent <Union Of Feature Topology> shall have their
universal fields set to SE_FALSE.
|
6 |