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Subsets attribute

Keywords:  subset relation

Defining an extent in an ODABA XML schema, a subSet attribute can be added for defining one or more subsets for the extent. The attribute string has the following syntax:

subSet =" subset1 [, subsetN ]"

Subset names are extent names separated by comma. In connection with superset definitions the distinct and complete option can be defined.

Notes:

The subset definition implicitly creates super set definitions for the referenced extents, i.e. super sets need not explicitly be defined for the extents referenced as subset.

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