FAQ

Question: What do you mean by value index?

Answer: A "value" or "range" index supports standard comparisons with =, >, < and the like. In short, the structural index helps with the expression

collection("/db")/doc/attribute/rut_afiliado

but you will also need a range index to speed up the value lookup on rut_afiliado:

rut_afiliado. ='8859471-1'

Folow reading: http://exist-db.org/indexing.html#rangeidx