code: func NewReaderFromMap(o interface{}) *Reader {
  	options := gojsonld.NewOptions("")
  	options.DocumentLoader = gojsonld.NewDocumentLoader()
  	data, err := gojsonld.ToRDF(o, options)
  	if err != nil {
  		return &Reader{err: err}
  	}
  	return &Reader{
  		graphs: data.Graphs,
  	}
  }
docs: // NewReaderFromMap returns quad reader for JSON-LD map object.