Create IFC_roundtrip_specifications.md
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This file lists "exercises" to be performed by a BIM application to achieve adequate round-tripping
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with IFC files. The application should successfully complete all the steps.
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## 1. importing and exporting a simple extrusion
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The application should be able to export and import an IFC file containing one IfcBuildingElementProxy
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entity, with one representation, which is an IfcExtrudedAreaSolid, based on an IfcArbitraryClosedProfileDef
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made of an IfcPolyline, like the example below:
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```
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#20= IFCBUILDINGELEMENTPROXY('0ohBfsArr3ruXYxacT4yl5',#1,'NOTDEFINED',$,$,#2,#21,$,.NOTDEFINED.);
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#21= IFCPRODUCTDEFINITIONSHAPE($,$,(#22));
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#22= IFCSHAPEREPRESENTATION(#9,'Body','SweptSolid',(#23));
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#23= IFCEXTRUDEDAREASOLID(#24,$,#25,2000.);
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#24 = IFCARBITRARYCLOSEDPROFILEDEF(.AREA., $, #26);
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#26 = IFCPOLYLINE((#27, #28, #29, #30));
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#27 = IFCCARTESIANPOINT((0., 0.));
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#28 = IFCCARTESIANPOINT((1000., 0.));
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#29 = IFCCARTESIANPOINT((1000., 1000.));
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#30 = IFCCARTESIANPOINT((0., 1000.));
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#25= IFCDIRECTION((0.,0.,1.));
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```
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#### Import criteria
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* The extrusion can be changed after import
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* The base polyline can be edited after import
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#### Export criteria
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* The exported IFC file contains an IfcBuildingElementProxy, with an IfcExtrudedAreaSolid as its representation
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and an IfcArbitraryClosedProfileDef made of an IfcPolyline as its profile
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#### Results
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| | BlenderBIM | FreeCAD | Revit | ArchiCAD | BricsCAD |
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| -------------- | ---------- | ------- | -------- | -------- | -------- |
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| passed? | | | | | |
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| exported file: | | | | | |
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| imported file: | | | | | |
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