sort-key Sort Key for Index Entry
Provides an alternative version of the index entry for use as a sort key, for example, an ASCII version replacing an accepted character with an unaccented one.
OPTIONAL on elements: <index-entry>, <index-term>
|Text, numbers, or special characters||A version of the index entry for sorting.|
|Restriction||@sort-key is an optional attribute; there is no default.|
Index entry with an alternate ASCII version for a Spanish name
... <index-entry sort-key="Cortes, Hernan"> <term>Cortés, Hern´n</term> </index-entry> ...