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One of the major design features of OpenACS 5.4.2 is the explicit representation -of object identity. The reason I say "explicit -representation" is because the concept of object identity has been +of object identity. The reason I say "explicit +representation" is because the concept of object identity has been around forever. It is inherent to our problem domain. Consider the example of 3.x style scoping. The 3.x data models use the triple (user_id, group_id, scope) to identify an object. In the 5.4.2 data model this