primaryPartType
The primary type of the part defines the type of the part (e.g. ConnectorHousing, Fixing, etc.) Since the VEC supports dual use parts (e.g. Fixing & WireProtection) the primary part type is necessary to define which specification associated to part is the primary character of the part. Therefore all primary part types correspond to a PartOrUsageRelatedSpecification (e.g. ConnectorHousing --> ConnectorHousingSpecification).