generic - Generic index

When a key definition refers to exactly one generic attribute (e.g. language depending name), a set of indexes is created, i.e. for each attribute type (e.g. language) a separate index is setup.

Typically, this feature is used to create language depending indexes . In order to select an access key for a generic index, the attribute type (e.g. language) has to be passed when calling accessKey() .

When the function is called with an invalid index definition, it throws an exception.