Questions about the format of the surface element name in gbXML

[Anonymous]

Dear Officer,

I am exporting gbXML file from Revit Architecture 2013. And I am looking at the format of the name of the surface element. According to the Autodesk wikihelp, I understand that it is composed in a form as :

orientation-space-(other space)-exposure-type-sequence number-(opening type)

It means if the surface is an interior wall surface, there will be two adjacent space names recored here. such as N-101-102-E-W-D-84 

But I notice that in my gbXML file, I have some terms like :  B-2-2-I-F-10, B-2-2-I-F-16, X-1-1-I-O-6, and 

X-1-1-I-O-15,  I notice that when the orientation is "Botom" or it is a type of "air", the space names will repeated twice. Why does it happen? Is there any special meanings for this?

Thanks! 

Best,

Na 

[AnnaOscarson]

Hi Na,

I think the behavior you see may be related to the floor element bounding the space; it may have the "Function" parameter set to “Interior” instead of "Exterior" (The "Function" parameter is a Type Property).

When a surface is categorized as interior it needs to be adjacent to two spaces. If it is only adjacent to one, then the same space name will be used.

Hope this helps.
Anna