code: def xslt_transformation(xml, template):
      
      transformer = ET.XSLT(
          _read_template(template)
      )
      newdom = transformer(
          _read_marcxml(xml)
      )
  
      return ET.tostring(newdom, pretty_print=True, encoding="utf-8")
docs: Transform `xml` using XSLT `template`.
  
      Args:
          xml (str): Filename or XML string. Don't use ``\\n`` in case of
                     filename.
          template (str): Filename or XML string. Don't use ``\\n`` in case of
                          filename.
  
      Returns:
          str: Transformed `xml` as string.