IFC entities are case sensitive or not ?

[Anonymous]

Can anybody help in knowing that IFC entites are Case Senstive or Case insenstive.
like
Can we write IFCPERSON as IfcPerson (camel case) and ifcperson (small) 
in an .ifc file

[nmarcelis]

Technically, parsers might accept non-case sensitive keywords, however, if you wanted to be correct to the STEP ISO 10303 specification it has to be all UPPERCASE.

I do however mostly see the Camelcase notation with IFC. I would continue on the tough that they are indeed case sensitive.