The RDF query server used by these forms accepts the following
query language, similar to R. V. Guha's RDFDB
QL:
SELECT variables [FROM url, url] WHERE (pred variable/string
variable/string) .... () () [AND constraint] [USING predString FOR
predUrl]
variables must start with a ? and contain no spaces
the arguments to FROM are urls which are de-serialized and treated
as the basis for the query. If there is no FROM clause the a
default SQL database will be used.
pred can be a predicate string e.g dc::title or a full property
name. If a predicate string, add on a USING clause to specify what
the predicate string stands for (e.g. USING dc FOR
http://purl.org/dc/1.1/)
constraints can be variable > | < | = | > =| < = | ~
value where value should be an integer, except in the case of ~
where it should be a string