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Extent definitions

Keywords:  Identifying key

ODABA supports any number of extent definitions (in contrast to one supported by ODMG). Extent definitions are necessary for defining global collections as offset in a database object. A structure defining extents must define an identifying key.

In contrast to ODMG ODL ODABA requires a semicolon after the extent definitions, instead of comma.

Definition: 

extent_spec := extent extents_def ';'