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The SEDRIS Data Representation Model
APPENDIX B - Constraints Non Empty Environment Root Instance |
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An <Environment Root> instance shall have either a <Feature Hierarchy> component, a <Geometry Hierarchy> component, or both.
An <Environment Root> instance is optional in a transmittal, but a "vacuous" <Environment Root> instance is not permitted. The DRM notation cannot enforce an "or" aggregation. Consequently, this constraint is required.
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