- The GPC schema provides an optional four-tier hierarchy; segment, family, class and brick (GPC bricks may be used independently without the hierarchy). The hierarchy should be easy to understand/follow and balanced in order to facilitate search.
- Each level of the schema is determined by rules and/or principles, and also industry decision. However, the rules applied differ depending on the hierarchy level.
- The business rules apply to all levels or entities of the schema.
- Each brick may be assigned one or more attributes; in turn each brick attribute has a set of associated mutually-exclusive brick attribute values.
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