# File lib/html5/filters/validator.rb, line 514
  def check_boolean(token, tag_name, attr_name, attr_value)
    enumerated_values = [attr_name, '']
    if !enumerated_values.include?(attr_value)
      yield( {:type => "ParseError",
           :data => "invalid-boolean-value",
           :datavars => {"tagName" => tag_name,
                "attributeName" => attr_name,
                "enumeratedValues" => enumerated_values}})
      yield( {:type => "ParseError",
           :data => "invalid-attribute-value",
           :datavars => {"tagName" => tag_name,
                "attributeName" => attr_name}})
    end
  end