# SurfaceOrSolidModel representation type

**URL:** <https://forums.buildingsmart.org/t/surfaceorsolidmodel-representation-type/2690>\
**Category:** Developers\
**Tags:** ifc4\
**Created:** [May 12, 2020, 6:50pm UTC](https://forums.buildingsmart.org/t/surfaceorsolidmodel-representation-type/2690 "2020-05-12T18:50:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![claimred](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@claimred](https://forums.buildingsmart.org/u/claimred)\
**Post date:** [May 12, 2020, 6:50pm UTC](https://forums.buildingsmart.org/t/surfaceorsolidmodel-representation-type/2690/1 "2020-05-12T18:50:22Z")

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I noticed a special representation type formally described in a function `IfcShapeRepresentationTypes` called `SurfaceOrSolidModel` capable of holding different types. [https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2\_TC1/HTML/link/ifcshaperepresentationtypes.htm](https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/link/ifcshaperepresentationtypes.htm)

However, it’s not mentioned here: [https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2\_TC1/HTML/link/ifcshaperepresentation.htm](https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/link/ifcshaperepresentation.htm).

Is that a documentation issue?

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<div class="post-metadata">

**Author:** ![Moult](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/moult/32/196_2.png) [@Moult](https://forums.buildingsmart.org/u/Moult)\
**Post date:** [May 12, 2020, 10:00pm UTC](https://forums.buildingsmart.org/t/surfaceorsolidmodel-representation-type/2690/2 "2020-05-12T22:00:59Z")

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At a glance, looks like a documentation bug.