  We consider the following query answering problem: Given a Boolean
conjunctive query and a theory in the Horn loosely guarded fragment, the aim is
to determine whether the query is entailed by the theory. In this paper, we
present a resolution decision procedure for the loosely guarded fragment, and
use such a procedure to answer Boolean conjunctive queries against the Horn
loosely guarded fragment. The Horn loosely guarded fragment subsumes classes of
rules that are prevalent in ontology-based query answering, such as Horn ALCHOI
and guarded existential rules. Additionally, we identify star queries and cloud
queries, which using our procedure, can be answered against the loosely guarded
fragment.
