/etc/sgml/docbook-mathml.cat is in docbook-mathml 1.1CR1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | CATALOG /usr/share/xml/docbook/custom/mathml/catalog
CATALOG /usr/share/xml/docbook/custom/mathml/1.0/catalog
CATALOG /usr/share/xml/docbook/custom/mathml/1.1b1/catalog
CATALOG /usr/share/xml/docbook/custom/mathml/1.1CR1/catalog
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