# IFC (General Development) **URL:** https://forums.buildingsmart.org/c/developers/ifc-general-development/87.md [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) --- ## [About the IFC (General Development) category](https://forums.buildingsmart.org/t/about-the-ifc-general-development-category/4236)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 0
--- ## [Can an IFC STEP file contain entities that are not in a direct or indirect relationship with the spatial structure?](https://forums.buildingsmart.org/t/can-an-ifc-step-file-contain-entities-that-are-not-in-a-direct-or-indirect-relationship-with-the-spatial-structure/5418)
**Author:** [@marw](https://forums.buildingsmart.org/u/marw)\ **Replies:** 15\ **Last updated:** [June 29, 2024, 1:51pm UTC](https://forums.buildingsmart.org/t/can-an-ifc-step-file-contain-entities-that-are-not-in-a-direct-or-indirect-relationship-with-the-spatial-structure/5418 "2024-06-29T13:51:10Z")
A scientific article was just released, with the title: “Cypher4BIM: Releasing the Power of Graph for Building Knowledge Discovery” (I am not allowed to share the link in this forum) This article gives some examples o… --- ## [Proxy for IfcDistributionElement](https://forums.buildingsmart.org/t/proxy-for-ifcdistributionelement/5271)
**Author:** [@CamChatHel](https://forums.buildingsmart.org/u/CamChatHel)\ **Replies:** 0\ **Last updated:** [April 4, 2024, 7:51am UTC](https://forums.buildingsmart.org/t/proxy-for-ifcdistributionelement/5271 "2024-04-04T07:51:31Z")
Hello Everyone, I have a question regarding IfcDistributionElement. I need a ProxyElement, that is a subclass of IfcDistributionElement and not a subclass of IfcBuiltElement. Can I use just IfcDistributionElement for t… --- ## [Why is there no IfcProjectionElementType?](https://forums.buildingsmart.org/t/why-is-there-no-ifcprojectionelementtype/4637)
**Author:** [@angel.velez](https://forums.buildingsmart.org/u/angel.velez)\ **Replies:** 6\ **Last updated:** [March 2, 2023, 11:35pm UTC](https://forums.buildingsmart.org/t/why-is-there-no-ifcprojectionelementtype/4637 "2023-03-02T23:35:13Z")
It seems like without a type, it is a sub-optimal entity type to use for mapping objects that have both instance and type properties. --- ## [Qto\_\*BaseQuantities suggestion](https://forums.buildingsmart.org/t/qto-basequantities-suggestion/4536)
**Author:** [@agron](https://forums.buildingsmart.org/u/agron)\ **Replies:** 15\ **Last updated:** [January 26, 2023, 11:52am UTC](https://forums.buildingsmart.org/t/qto-basequantities-suggestion/4536 "2023-01-26T11:52:39Z")
Hi, I have been struggling with some QTO topics in my daily routines and would like to make an improvement suggestion. When defining deliverables in a BEP, I often stumble upon Quantities that are not standard definiti… --- ## [Multiple "body" representations for a single IfcProductRepresentation](https://forums.buildingsmart.org/t/multiple-body-representations-for-a-single-ifcproductrepresentation/4405)
**Author:** [@angel.velez](https://forums.buildingsmart.org/u/angel.velez)\ **Replies:** 10\ **Last updated:** [October 20, 2022, 11:51am UTC](https://forums.buildingsmart.org/t/multiple-body-representations-for-a-single-ifcproductrepresentation/4405 "2022-10-20T11:51:45Z")
Hello all, I have seen some files that have multiple IfcShapeRepresentations of type “Body”. It seems to me that this is ambiguous - should import have those are alternate body representations, or should they be combine… --- ## [Ifc missing Entities](https://forums.buildingsmart.org/t/ifc-missing-entities/4320)
**Author:** [@marslandp](https://forums.buildingsmart.org/u/marslandp)\ **Replies:** 1\ **Last updated:** [July 25, 2022, 5:49pm UTC](https://forums.buildingsmart.org/t/ifc-missing-entities/4320 "2022-07-25T17:49:27Z")
I work on many projects where IFC is a required deliverable. In order to produce well structured IFC (using the dreaded R word) we hard code all Ifc entity types and entity type enumerations into our object libraries. W… --- ## [How do we properly handle apostrophes in IfcLabel?](https://forums.buildingsmart.org/t/how-do-we-properly-handle-apostrophes-in-ifclabel/4231)
**Author:** [@ian](https://forums.buildingsmart.org/u/ian)\ **Replies:** 5\ **Last updated:** [May 16, 2022, 11:36am UTC](https://forums.buildingsmart.org/t/how-do-we-properly-handle-apostrophes-in-ifclabel/4231 "2022-05-16T11:36:39Z")
We have an IfcLabel which contains an apostrophe and it’s breaking at least two viewers that we know of. How do we escape “special” characters in IFC with a guarantee that viewers will handle un-escaping? --- ## [IFC Structure](https://forums.buildingsmart.org/t/ifc-structure/4215)
**Author:** [@Enrico](https://forums.buildingsmart.org/u/Enrico)\ **Replies:** 2\ **Last updated:** [May 8, 2022, 7:42am UTC](https://forums.buildingsmart.org/t/ifc-structure/4215 "2022-05-08T07:42:46Z")
Hello there Are there any requirements that specify how the entries in an IFC (#1,#2,#3, etc.) should be listed? Is such a random structure in an IFC file allowed? I have seen already files with a random order. #2 #3… --- ## [Primitves defined in the schema](https://forums.buildingsmart.org/t/primitves-defined-in-the-schema/1782)
**Author:** [@jonm](https://forums.buildingsmart.org/u/jonm)\ **Replies:** 1\ **Last updated:** [September 3, 2019, 11:40am UTC](https://forums.buildingsmart.org/t/primitves-defined-in-the-schema/1782 "2019-09-03T11:40:48Z")
Should primitives be defined in the IFC schema? Or are they in effect a reference type. Some attributes refer to these rather than the IFC equivalent. https://github.com/buildingSMART/IFC/tree/master/Sections/Resource%…