Fixed: RDF terms that occur in the subject and/or object position of triples with predicate term rdfs:subPropertyOf denote properties (i.e., resources that belong to the class denoted by rdf:Property).
Merge branch 'master' into Dataset-Support
FIXED: Various issues around ORDER BY on multiple variables.
FIXED: Make ORDER BY understand numerical values.
FIXED: regex(string literal text, simple literal pattern, [flags])
must accept accept "String arguments" (sec 17.4.3.1.1): both plain
literals and literals with a language tag.
Merge branch 'master' into Dataset-Support