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The SEDRIS Data Representation Model
APPENDIX B - Constraints Non Crossing Aggregations |
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Aggregations shall not cross <Model> instances and/or <Environment Root> instances.
Why would a generic <Model> use pieces of the terrain? If the <Model> is intended to be instanced as part of the terrain of the <Environment Root>, then <Environment Root> should instance the <Model>, not duplicate parts of it.
If a <Model> instance or an <Environment Root> instance needs to use an instance of another <Model>, use a <Feature Model Instance> or <Geometry Model Instance>. If only a portion of the <Model> is desired for reuse, that portion should be a <Model> of its own.
If a <Polygon> is under <Environment Root>, no <Model> can use the <Polygon>.
If a <Polygon> is under a <Model>, <Environment Root> cannot use the <Polygon> directly. A <Model>'s components can be accessed only via <Geometry Model Instances> and / or <Feature Model Instances>.
If a <Polygon> is under a <Model>, no other <Model> can use that <Polygon> directly. A <Model>'s components can be accessed only via <Geometry Model Instances> and / or <Feature Model Instances>.
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