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• a unique OID
• a list of names, of which the first one is the primary name (names are case insensitives)
• a type ( ABSTRACT, AUXILIARY or STRUCTURAL)
• a flag to tell if the ObjectClass is obsolote or not
• the list of its superior, if any

The key is the OID.

The relations are : 

1. An ObjectClass is contained by only one schema
2. A schema caan contains 0 to N ObjectClass
3. An ObjectClass may have one or more superior
4. An ObjectClass may be the superior of one or more ObjectClass
5. An ObjectClass has only one OID
6. An ObjectClass has 0 to N mandatory AttributeType
7. An ObjectClass has 0 to N authorized AttributeType
8. An ObjectClass may have more than on name
9. A name uniquely identify an ObjectClass

1. An AttributesType is contained by only one schema
2. An OID is associated with N ObjectClass name
3. An OID is associated with N AttributesType name
4. A ObjectClass name is associated with only one OID
5. A AttributesType name is associated with only one OID
6. An ObjectClass name has only one OID
7. An AttributesType name has only one OID
8. An OID is associated with only one ObjectClass
9. ... (To be continued)

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