... h3.Definition: Attribute Type
An attribute type is a [schema|Definition -- Schema] element that correlates an [OID|Definition -- Object Identifier] and a set of names with an [attribute syntax|Definition -- Attribute Syntax] and a set of [matching rules|Definition -- Matching Rule].
The components of an attribute type definition include:
* An OID used to uniquely identify the attribute type.
* A set of zero or more names that can be used to more easily reference the attribute type.
* An optional equality matching rule that specifies how equality matching should be performed on values of that attribute. If no equality matching rule is specified, then the default equality rule for the associated attribute syntax will be used. If the associated syntax doesn't have a default equality matching rule, then equality operations will not be allowed for that attribute.
* An optional ordering matching rule that specifies how ordering operations should be performed on values of that attribute. If no ordering matching rule is specified, then the default ordering rule for the associated attribute syntax will be used. If the associated syntax doesn't have a default ordering matching rule, then ordering operations will not be allowed for that attribute.
* An optional substring matching rule that specifies how substring matching should be performed on values of that attribute. If no substring matching rule is specified, then the default substring rule for the associated attribute syntax will be used. If the associated syntax doesn't have a default substring matching rule, then subsring operations will not be allowed for that attribute.
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