Documentations
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The IFC specification is available at the following locations for online use or for download.
| Version | online access | download |
| IFC4 Add2 (2016) | Industry Foundation Classes Release 2x4 (IFC4) IFC4 - Addendum 2 (Final Standard) Specification | download registration |
| IFC4 Add1 (2014) | Industry Foundation Classes Release 2x4 (IFC4) IFC4 - Addendum 1 (Final Standard) Specification | download registration |
| IFC4 Final (2013) | Industry Foundation Classes Release 2x4 (IFC4) Release Candidate 3 Specification | download registration |
| IFC 2x3 TC1 x(2007) | IFC 2x Edition 3 Technical Corrigendum 1 (IFC 2x3 TC1) Specification | download registration |
| IFC 2x3 | IFC 2x Edition 3 (IFC 2x3) Specification | select download |
| IFC 2x2 Add 1 | IFC 2x2 Addendum 1 Specification | |
| IFC 2x2 *** | IFC 2x Edition 2 (IFC 2x2) Specification | |
| IFC 2x Add 1 | IFC 2x Addendum 1 Specification | |
| IFC 2x ** | IFC 2x Specification | |
| IFC 2.0 * | IFC 2.0 Object Model Reference | |
| IFC 1.5.1 * | IFC 1.5.1 Object Model Reference |
Note * out of date - these releases are not any longer supported ** out of date - for IFC2x exchange use the IFC2x Add 1 instead, for new implementations go directly to IFC2x3 *** out of date - for IFC2x2 exchange use the IFC2x2 Add 1 instead, for new implementations go directly to IFC2x3 x documentation and consistency rule update of IFC2x3