: fl=date_deposited&fq=date[2013-07-01T00:00:00Z TO 2013-07-31T23:59:00Z]&fq=collection_id(1 2 n)&q.op=OR
typo -- the colon is missing...
fq=collection_id:(1 2 n)
if you don't want the q.op to apply globally to your request, you can also
scope it only for that filter. likewise the "field_name:" and paren syntax
can be replaced by using the "df" param...
fq={!lucene q.op=OR df=collection_id}1 2 3 4 5
-Hoss
