# MVDs **URL:** https://forums.buildingsmart.org/c/developers/developer-mvds/37.md [Latest](https://forums.buildingsmart.org/latest.md) · [Categories](https://forums.buildingsmart.org/categories.md) · [Tags](https://forums.buildingsmart.org/tags.md) --- ## [About the MVDs category](https://forums.buildingsmart.org/t/about-the-mvds-category/57)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 0
--- ## [Official Model View Definitions for IFC 4.3](https://forums.buildingsmart.org/t/official-model-view-definitions-for-ifc-4-3/5737)
**Author:** [@schilu](https://forums.buildingsmart.org/u/schilu)\ **Replies:** 6\ **Last updated:** [June 2, 2025, 6:01am UTC](https://forums.buildingsmart.org/t/official-model-view-definitions-for-ifc-4-3/5737 "2025-06-02T06:01:17Z")
Hi, Where can I find the definitions of the official Model View Definitions (Reference View, Alignment Based Reference View, Design Transfer View) for IFC 4.3? There is no direct link in the IFC documentation. Also, th… --- ## [IFC4.3.2.0 Chapter 4 documentation error? - 4.1.2.4 Documentation Association](https://forums.buildingsmart.org/t/ifc4-3-2-0-chapter-4-documentation-error-4-1-2-4-documentation-association/5955)
**Author:** [@jwouellette](https://forums.buildingsmart.org/u/jwouellette)\ **Replies:** 0\ **Last updated:** [February 20, 2025, 3:54pm UTC](https://forums.buildingsmart.org/t/ifc4-3-2-0-chapter-4-documentation-error-4-1-2-4-documentation-association/5955 "2025-02-20T15:54:22Z")
Currently, “4 Fundamental concepts and assumptions” does NOT indicate that “4.1.2.4 Document Association” is within scope of either base MVD, BUT the individual entries for IfcDocumentReference and IfcDocumentInformation… --- ## [Deciphering Concept Usage in MVDs: Identifying Compatibility, Incompatibility, and Irrelevance for Export](https://forums.buildingsmart.org/t/deciphering-concept-usage-in-mvds-identifying-compatibility-incompatibility-and-irrelevance-for-export/5010)
**Author:** [@shihangzhang](https://forums.buildingsmart.org/u/shihangzhang)\ **Replies:** 1\ **Last updated:** [November 5, 2023, 11:11am UTC](https://forums.buildingsmart.org/t/deciphering-concept-usage-in-mvds-identifying-compatibility-incompatibility-and-irrelevance-for-export/5010 "2023-11-05T11:11:25Z")
Hello, everyone. I’ve recently been delving into information exchange requirements based on MVDs. However, I’m facing some uncertainties regarding the fundamental concepts. Specifically: (1) How do we categorize concep… --- ## [Revit to IFC, Wall is dislocated](https://forums.buildingsmart.org/t/revit-to-ifc-wall-is-dislocated/4575)
**Author:** [@andreasd](https://forums.buildingsmart.org/u/andreasd)\ **Replies:** 3\ **Last updated:** [January 16, 2023, 2:41pm UTC](https://forums.buildingsmart.org/t/revit-to-ifc-wall-is-dislocated/4575 "2023-01-16T14:41:49Z")
Hello, I export from Revit IFC4… i have a wall that is always dislocated, how to solve it? KR Andreas --- ## [IfcSpace representations in Reference View](https://forums.buildingsmart.org/t/ifcspace-representations-in-reference-view/3318)
**Author:** [@claimred](https://forums.buildingsmart.org/u/claimred)\ **Replies:** 5\ **Last updated:** [February 3, 2021, 7:00pm UTC](https://forums.buildingsmart.org/t/ifcspace-representations-in-reference-view/3318 "2021-02-03T19:00:05Z")
Do IfcSpaces in Reference View allow anything except IfcExtrudedAreaSolid/IfcRevolvedAreaSolid based on IndexedPolyCurves? RV doc clearly states that only Body SweptSolid PolyCurve Geometry concept is applied. I am a bi… --- ## [Software capable of mvdxml consuming](https://forums.buildingsmart.org/t/software-capable-of-mvdxml-consuming/2763)
**Author:** [@claimred](https://forums.buildingsmart.org/u/claimred)\ **Replies:** 7\ **Last updated:** [August 3, 2020, 3:55pm UTC](https://forums.buildingsmart.org/t/software-capable-of-mvdxml-consuming/2763 "2020-08-03T15:55:31Z")
What are some good examples of exporter software that are capable of consuming mvdxml files to export IFC accordingly? Are there any? --- ## [mvdXML Rule Grammar and utf-8?](https://forums.buildingsmart.org/t/mvdxml-rule-grammar-and-utf-8/2442)
**Author:** [@Noemi](https://forums.buildingsmart.org/u/Noemi)\ **Replies:** 3\ **Last updated:** [July 22, 2020, 11:32am UTC](https://forums.buildingsmart.org/t/mvdxml-rule-grammar-and-utf-8/2442 "2020-07-22T11:32:15Z")
I have got a question, the “Lexer Rules” in “Rule Grammar” don’t contain any language specific characters, such as (german) ß, ö, ä, ü, …, why? Why not utf-8 (or something similar)? --- ## [Multiple definitions with similar root entity](https://forums.buildingsmart.org/t/multiple-definitions-with-similar-root-entity/2678)
**Author:** [@KavehAll](https://forums.buildingsmart.org/u/KavehAll)\ **Replies:** 0\ **Last updated:** [May 7, 2020, 2:01pm UTC](https://forums.buildingsmart.org/t/multiple-definitions-with-similar-root-entity/2678 "2020-05-07T14:01:29Z")
By MVD implementation in IfcDoc, Would it be ok to have multiple table definitions with the same root entity, with difference in their attributes/concepts/constraints ?I have not seen anything for or against it! Thanks, … --- ## [Concept inheritance](https://forums.buildingsmart.org/t/concept-inheritance/2668)
**Author:** [@KavehAll](https://forums.buildingsmart.org/u/KavehAll)\ **Replies:** 2\ **Last updated:** [May 6, 2020, 8:08am UTC](https://forums.buildingsmart.org/t/concept-inheritance/2668 "2020-05-06T08:08:01Z")
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 fro… --- ## [Model View Definition structure](https://forums.buildingsmart.org/t/model-view-definition-structure/2656)
**Author:** [@KavehAll](https://forums.buildingsmart.org/u/KavehAll)\ **Replies:** 0\ **Last updated:** [April 29, 2020, 1:51pm UTC](https://forums.buildingsmart.org/t/model-view-definition-structure/2656 "2020-04-29T13:51:30Z")
Hi, Trying to develop a MVD using IfcDoc, I am wondering what is the difference, if one entity/concept is listed under another table definition(another entity) as a column definition or when it is seperately listed as a… --- ## [IFC schemas for raceways / cable trays](https://forums.buildingsmart.org/t/ifc-schemas-for-raceways-cable-trays/2370)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\ **Replies:** 1\ **Last updated:** [February 4, 2020, 10:11pm UTC](https://forums.buildingsmart.org/t/ifc-schemas-for-raceways-cable-trays/2370 "2020-02-04T22:11:06Z")
Is there any MVS for raceways cable tracing? Have somebody an examples of IFC files refer to this domain? --- ## [IfcMaterialConstituentSet + IfcShapeAspect + IfcPhysicalComplexProperty](https://forums.buildingsmart.org/t/ifcmaterialconstituentset-ifcshapeaspect-ifcphysicalcomplexproperty/2164)
**Author:** [@igor.sokolov](https://forums.buildingsmart.org/u/igor.sokolov)\ **Replies:** 2\ **Last updated:** [December 17, 2019, 2:08pm UTC](https://forums.buildingsmart.org/t/ifcmaterialconstituentset-ifcshapeaspect-ifcphysicalcomplexproperty/2164 "2019-12-17T14:08:15Z")
Is any application able to import all this information together? or plan to implement? Is anybody thinking this monster construction is simpler than IfcMaterialLayerSetUsage? Should not bSI remove this nightmare from f… --- ## [Problems when parsing and automating ReferenceView\_V1-2.mvdxml](https://forums.buildingsmart.org/t/problems-when-parsing-and-automating-referenceview-v1-2-mvdxml/1935)
**Author:** [@Helland](https://forums.buildingsmart.org/u/Helland)\ **Replies:** 1\ **Last updated:** [November 18, 2019, 7:25am UTC](https://forums.buildingsmart.org/t/problems-when-parsing-and-automating-referenceview-v1-2-mvdxml/1935 "2019-11-18T07:25:29Z")
Hi, I’m working on parsing the ReferenceView MvdXML document, and I have some problems and annoyances that I want to share. I really hope they will be addressed in the future. Problem 1: Some of the expressions in Temp… --- ## [Unit of pset/qset values out of scope for Reference View, why?](https://forums.buildingsmart.org/t/unit-of-pset-qset-values-out-of-scope-for-reference-view-why/1953)
**Author:** [@trondholen](https://forums.buildingsmart.org/u/trondholen)\ **Replies:** 0\ **Last updated:** [October 28, 2019, 11:12am UTC](https://forums.buildingsmart.org/t/unit-of-pset-qset-values-out-of-scope-for-reference-view-why/1953 "2019-10-28T11:12:51Z")
We posted this thread on b-Cert: https://b-cert.org/Discussion/Sections/29670a46-a1e8-426f-542c-08d4c87c74c1/Forums/9edb9460-d7bd-4c0d-090e-08d4c87cb4b9/Threads/98e14aa1-af7c-4db9-ee86-08d74bec36e7 But we should rather…