IDEF1X Categorization 

Type - Term
Description: An IDEF1X Categorization is a type of relationship that defines the scheme that distinguishes among related subtype Entities. It defines what the scheme is, not how, where, or when the scheme is used or who uses it. If a categorization value is known, it will be used to differentiate between subtypes. 
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Comments: Source: From OV-7 Product Team (APG)