public KeyIndex getKeyIndex(String name) {
// Return an empty key index iterator if none are defined
if (_keyIndexes == null) return(_emptyKeyIndex);
// Look up the requested key index
final KeyIndex index = (KeyIndex)_keyIndexes.get(name);
// Return an empty key index iterator if the requested index not found
if (index == null) return(_emptyKeyIndex);
return(index);