sparql.rb in sxp-2.0.0

- old
+ new

@@ -92,10 +92,11 @@
     # found with a previously identified {PREFIX}.
     # @return [Object]
     def read_token
       case peek_char
       when ?" then [:atom, read_rdf_literal] # "
+      when ?' then [:atom, read_rdf_literal] # '
       when ?< then [:atom, read_rdf_uri]
       else
         tok = super
         
         # If we just parsed "PREFIX", and this is an opening list, then
@@ -142,9 +143,10 @@
     ##
     # Reads literals corresponding to SPARQL/Turtle/Notation-3 syntax
     #
     # @example
     #   "a plain literal"
+    #   'another plain literal'
     #   "a literal with a language"@en
     #   "a typed literal"^^<http://example/>
     #   "a typed literal with a PNAME"^^xsd:string
     #
     # @return [RDF::Literal]