Rule Name: Non Crossing Associations

Definition

Associations can't cross Models and/or Environment Root, except for Geometry Model Instance to Geometry Model, and Feature Model Instance to Feature Model.

Rationale

Consider the Feature with Geometry Hierarchy association. This association means that the Feature is an alternate representation of the Geometry Hierarchy. A terrain Feature represents some part of the terrain, not a part of some Model; a Model feature represents some abstraction of the Model rather than a feature of the terrain.

Example

1. Consider a transmittal with an Environment Root and Model Library. Let "F15" be a Model in the Model Library, under which we have Polygons. No Feature under the Environment Root may associate with an "F15" Polygon, since a terrain Feature cannot at the same time represent a generic "F15" Polygon.

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