SPARQL is the standard RDF query language. AllegroGraph provides full support for SPARQL 1.1 Query and Update. The documentation includes

SPARQL Reference
A reference for AllegroGraph's SPARQL implementation.
SPIN is a SPARQL representation for rules and constraints. This document describes AllegroGraph's spin implementation.
Magic Properties
A magic property is a SPARQL predicate that produces bindings using something other than simple sub-graph matching. This document describes AllegroGraph's magic properties and how they integrate SPARQL with freetext indexes, geospatial queries, temporal reasoning, Social Networking Analysis, and direct reification.
Lisp S-Expression Syntax
A description of the Lisp S-Expression syntax used by the SPARQL 1.1 query engine.
AGWebView SPARQL Tutorial
A SPARQL tutorial using AllegroGraph's WebView.
Release notes
Notes on the status of the SPARQL implementation.