/usr/share/xml/schema/w3c/mathml/dtd/catalog is in w3-dtd-mathml 2.0.0.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | -- SGML catalog for w3-dtd-mathml --
OVERRIDE YES
PUBLIC "-//W3C//DTD MathML 2.0//EN" "mathml2.dtd"
PUBLIC "-//W3C//DTD MathML//EN" "mathml2.dtd"
SYSTEM "http://www.w3.org/TR/MathML2/dtd/mathml2.dtd" "mathml2.dtd"
PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "xhtml-math11-f.dtd"
SYSTEM "http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd" "xhtml-math11-f.dtd"
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