# Concept inheritance

**URL:** <https://forums.buildingsmart.org/t/concept-inheritance/2668>\
**Category:** MVDs\
**Tags:** ifc4, mvdxml\
**Created:** [May 5, 2020, 1:03pm UTC](https://forums.buildingsmart.org/t/concept-inheritance/2668 "2020-05-05T13:03:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KavehAll](https://avatars.discourse-cdn.com/v4/letter/k/a4c791/32.png) [@KavehAll](https://forums.buildingsmart.org/u/KavehAll)\
**Post date:** [May 5, 2020, 1:03pm UTC](https://forums.buildingsmart.org/t/concept-inheritance/2668/1 "2020-05-05T13:03:54Z")

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Hi all,  
If I need a concept for one or more root entities,eg spatial composition/decomposition, can I add them for a parent entity,let’s say IfcObject/IfcProduct then expect all the child entity inherit that concept from the parent?  
There is an inheritance feature in Ifcdoc which is a bit vague to me how it works.  
I assume that is related to this. there one can accept/override/suppress that particular concept. I am not sure it is what I want.  
For instance: In IfcReinforcingElement and IfcWall there is a Element voiding concept. In one it is marked to sppress concept in other it accept it. I am not sure why.  
Thanks,  
Kaveh

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**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 6, 2020, 5:56am UTC](https://forums.buildingsmart.org/t/concept-inheritance/2668/2 "2020-05-06T05:56:16Z")

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Can you link to the documentation which shows how element voiding is suppressed for ifcreinforcingelement or ifcwall? I cannot find this supression.

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<div class="post-metadata">

**Author:** ![KavehAll](https://avatars.discourse-cdn.com/v4/letter/k/a4c791/32.png) [@KavehAll](https://forums.buildingsmart.org/u/KavehAll)\
**Post date:** [May 6, 2020, 8:08am UTC](https://forums.buildingsmart.org/t/concept-inheritance/2668/3 "2020-05-06T08:08:01Z")

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The [page](https://technical.buildingsmart.org/resources/ifcdoc/) on the buildingSmart seems to be unavailable. I downloaded the `ifc4_add2.ifcdoc` before.In the reference view mvd of that, it looks like this(IfcWall inherit that actually from IfcElement -\>):

 ![grafik](https://us1.discourse-cdn.com/flex016/uploads/buildingsmart1/original/2X/0/01f4d9e50b9e0434a74d9f6fefdcae6b1305fa2a.png) ![grafik](https://us1.discourse-cdn.com/flex016/uploads/buildingsmart1/original/2X/e/e9086bc4cc56216b8c6db887d065f7f09b99a0da.png)