File names should be quoted

I happen to have a generated html file whose name is '<init>.html'. Linkcheck processes that file fine, but then it creates this report:
<file>
<name>nicedoc/nice/lang/<init>.html</name>
<successful>0</successful>
<unsuccessful>0</unsuccessful>
</file>
This is ill-formed xml, and xdoc rightfully chokes on it. linkcheck should use a quoting function to handle special character like <, >, &, ... in file names. I suppose such a function already exists, I just don't know where. If somebody point it out, I could do the patch to linkcheck.