Definition from IAI: Enumeration identifying the state or accessibility of the object (e.g., read/write, locked, etc.). This concept was initially introduced in IFC 2.0 as IfcModifiedFlag of type BINARY(3) FIXED and has been modified in R2x to an enumeration. It was initially introduced as a first step towards providing facilities for partial model exchange from a server as requested by the IFC implementers. It is intended for use primarily by a model server so that an application can identify the state of the object.
Valid enumerations are:
HISTORY: New enumeration in IFC R2.0.