lib/rdf/reasoner/rdfs.rb in rdf-reasoner-0.4.2 vs lib/rdf/reasoner/rdfs.rb in rdf-reasoner-0.4.3

@@ -221,9 +221,12 @@
       if respond_to?(:range) && !(ranges = Array(self.range) - [RDF::OWL.Thing, RDF::RDFS.Resource]).empty?
         if resource.literal?
           ranges.all? do |range|
             if [RDF::RDFS.Literal, RDF.XMLLiteral, RDF.HTML].include?(range)
               true  # Don't bother checking for validity
+            elsif range == RDF.langString
+              # Value must have a language
+              resource.has_language?
             elsif range.start_with?(RDF::XSD)
               # XSD types are valid if the datatype matches, or they are plain and valid according to the grammar of the range
                 resource.datatype == range ||
                 resource.plain? && RDF::Literal.new(resource.value, datatype: range).valid?
             elsif range.start_with?(RDF::Vocab::OGC)
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