def enrich_value(value)
      return nil unless value.is_a? DPLA::MAP::Controlled::DCMIType
      return nil unless TERMS.include? value.rdf_subject
      value
    end
def enrich_value(value)
      return nil unless value.is_a? DPLA::MAP::Controlled::DCMIType
      return nil unless TERMS.include? value.rdf_subject
      value
    end
@param value [Object] the value to enrich

 @return [DPLA::MAP::Controlled::DCMIType, nil] the original value or `nil`