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              Definition: | 
              Definitions of Master Data Attributes for Vocabulary Types.
  Each Master Data Attribute definition specifies a name for the Attribute (which must be unique across all attributes of the enclosing Vocabulary Type) and the data type for values of that attribute.
  Master Data definitions within a Data Definition Module may belong to new Vocabulary Types introduced by that Module, or may extend Vocabulary Types defined in other Modules. | 
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