Dear Maintainer,
Insatllation return these warnings :
,----
| Preparing to unpack .../python3-pyrdfa_3.6.2+ds-1_all.deb ...
| Unpacking python3-pyrdfa (3.6.2+ds-1) over (3.6.2+ds-1) ...
| Setting up python3-pyrdfa (3.6.2+ds-1) ...
| /usr/lib/python3/dist-packages/pyRdfa/extras/httpheader.py:344: SyntaxWarning: invalid escape sequence '\-'
| """Parses a quoted string.
| /usr/lib/python3/dist-packages/pyRdfa/extras/httpheader.py:355: SyntaxWarning: invalid escape sequence '\-'
| """Parses a token or a quoted-string.
| /usr/lib/python3/dist-packages/pyRdfa/extras/httpheader.py:518: SyntaxWarning: invalid escape sequence '\-'
| """Parses a ()-style comment from a header value.
| /usr/lib/python3/dist-packages/pyRdfa/rdfs/cache.py:21: SyntaxWarning: invalid escape sequence '\+'
| xml_application_media_type = re.compile("application/[a-zA-Z0-9]+\+xml")
| /usr/lib/python3/dist-packages/pyRdfa/termorcurie.py:61: SyntaxWarning: invalid escape sequence '\+'
| xml_application_media_type = re.compile("application/[a-zA-Z0-9]+\+xml")
| /usr/lib/python3/dist-packages/pyRdfa/utils.py:131: SyntaxWarning: invalid escape sequence '\?'
| _unquotedChars = ':/\?=#~'
`----
Christian