docs: def from_xml(xml):
          """
          Convert :class:`.MARCXMLRecord` object to :class:`.EPublication`
          namedtuple.
  
          Args:
              xml (str/MARCXMLRecord): MARC XML which will be converted to
                  EPublication. In case of str, ``<record>`` tag is required.
  
          Returns:
              structure: :class:`.EPublication` namedtuple with data about \
                         publication.
          """
          parsed = xml
          if not isinstance(xml, MARCXMLRecord):
              parsed = MARCXMLRecord(str(xml))
  
          # check whether the document was deleted
          if "DEL" in parsed.datafields:
              raise DocumentNotFoundException("Document was deleted.")
  
          # i know, that this is not PEP8, but you dont want to see it without
          # proper formating (it looks bad, really bad)
          return EPeriodical(
              url=parsed.get_urls(),
              ISSN=parsed.get_ISSNs(),
              nazev=parsed.get_name(),
              anotace=None,  # TODO: read the annotation
              podnazev=parsed.get_subname(),
              id_number=parsed.controlfields.get("001", None),
              datumVydani=parsed.get_pub_date(),
              mistoVydani=parsed.get_pub_place(),
              internal_url=parsed.get_internal_urls(),
              invalid_ISSNs=parsed.get_invalid_ISSNs(),
              nakladatelVydavatel=parsed.get_publisher(),
              ISSNSouboruPublikaci=parsed.get_linking_ISSNs(),
          )