
This is because libxml/libxslt are not the only implementations that respect $XML_CATALOG_FILES. Also, look in share/xml for catalogs (in addition to the now-deprecated xml/dtd and xml/xsl).
Description
Languages
Nix
96.3%
Shell
1.8%
Python
0.7%
Perl
0.4%
C
0.3%
Other
0.1%