/usr/share/doc/xml-core/examples/foo.xmlcatalogs is in xml-core 0.13+nmu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | local;catalog.xml;/usr/share/xml/schema/foo/catalog.xml
root-and-package;public;-//FOO//DTD FOO//EN;/usr/share/xml/schema/foo/catalog.xml
root-and-package;system;http://www.foo.org/foo/foo.dtd;/usr/share/xml/schema/foo/catalog.xml
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