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 ';'