att.sortable provides attributes for elements in lists or groups that are sortable, but whose sorting key cannot be derived mechanically from the element content. [9.1 Dictionary Body and Overall Structure]
Módulotei — The TEI Infrastructure
Miembrosbibl biblFull biblStruct correspAction entry entryFree event idno item list listApp listBibl listChange listEvent listNym listOrg listPerson listPlace listRelation listWit msDesc nym org person personGrp persona place relation superEntry term witness
sortKeysupplies the sort key for this element in an index, list or group which contains it.
Estado Opcional
Tipo de datos teidata.word
David's other principal backer, Josiah
ha-Kohen <index indexName="NAMES">
 <term sortKey="Azarya_Josiah_Kohen">Josiah ha-Kohen b. Azarya</term>
</index> b. Azarya, son of one of the last gaons of Sura was David's own first

La clave de ordenación se utiliza para determinar la secuencia y agrupar las entradas en un índice.