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# Descriptors

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Descriptors describe how a Java class relates to a data source representation. They relate object classes to the data source at the data model level. For example, persistent class attributes may map to database columns.

TopLink uses descriptors to store the information that describes how an instance of a particular class can be represented in a data source (see "Mappings"). Most descriptor information can be defined by TopLink Workbench, then read from the project XML file at run time.

See "Understanding Descriptors" for more information.