ANS85 

Conventions for Index-names

If a data item possessing the global attribute includes a table described with an index-name, that index-name also possesses the global attribute. Therefore, the scope of an index-name is identical to that of the data-name which names the table whose index is named by that index-name and the scope of name rules for data-names apply.

Index-names cannot be qualified.

OSVS Index-names can be qualified.