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 super set 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.