# Relation ship about IFC & COBIE

**URL:** <https://forums.buildingsmart.org/t/relation-ship-about-ifc-cobie/1478>\
**Category:** Users\
**Created:** [June 6, 2019, 4:26pm UTC](https://forums.buildingsmart.org/t/relation-ship-about-ifc-cobie/1478 "2019-06-06T16:26:02Z")\
**Posts on this page:** 1\
**Showing post:** 13

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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:** [October 4, 2019, 7:43am UTC](https://forums.buildingsmart.org/t/relation-ship-about-ifc-cobie/1478/13 "2019-10-04T07:43:45Z")

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Hi @pilarjimenez - you may be interested in this update, where I am codifying the COBie IFC-\>Spreadsheet relationships:

> [@COBie and IFC mapping](https://forums.buildingsmart.org/t/cobie-and-ifc-mapping/1796/4):
>
> As I could not find a satisfactory and transparent IFC-\>COBie spreadsheet converter, I am writing my own based off the official COBie responsibility matrix, discovered as the current “source of truth” for how COBie-\>spreadsheet mappings are meant to work thanks to @jonm. I am still in the process of doing so, but it seems as though that the updates to IFC4 are minor at a first glance (e.g. a particular attribute might’ve been renamed) The code will be in Python, which interprets exactly what i…

It will help answer your questions about how do the mappings translate to IFC4.

Please note that there are also two parts to this, there is the COBie MVD itself, which can be used to produce a compliant IFC, and then there is the IFC-\>Spreadsheet mapping, which allows you to extract the COBie MVD IFC file into a spreadsheet format. Please note that the mapping is _one-way_ - data loss occurs in the mapping process, and due to the complexity of the mapping (many-to-one relationships), it cannot be reversed.

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