Returns the set of content types with quality for available RDF::Reader subclasses.
accept_types = RDF::Format.accept_types # => %w(text/html;q=0.5 text/turtle ...)
Returns:
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# File 'lib/rdf/format.rb', line 279 def self.accept_types reader_symbols.flat_map {|s| RDF::Format.for(s).accept_type}.uniq end