lime:entry query

Hi Everyone,
Studying the ontolex model again I noticed there was no inverse relation
for the lime:entry relation between a lexicon and its entries. Won't this
cause problems if I'm working with a large lexicon where the individual
entries belong to separate files with the lexicon file pointing to each
entry? I can point one way (lexicon -> entry) but not back (at least not
with an ontolex relation). Or maybe I've misunderstood something.
Cheers,
Fahad