Attach metadata xml for the non-validating and validating example
(extraced with `pdfinfo -meta | xmllint format -`) in the
Github issue.
Here is a reference to the description element. Note that only
description seems to be redefined, not title.
it's not redefined -- it's dropped. And this is ok.
You can also check with
<dc:description>FOO</dc:description>
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="x-default">TITLE</rdf:li>
</rdf:Alt>
</dc:title>
and again it's valid.
But
and
suggest that dc:description and dc:title are of the same type,
which is coherent with
I.e. these are correct -- but Subject must agree with dc:description
<dc:description>
<rdf:Alt>
<rdf:li xml:lang="x-default"/>
</rdf:Alt>
</dc:description>
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="x-default">TITLE</rdf:li>
</rdf:Alt>
</dc:title>
At least, this is what I understand.