/usr/share/pacemaker/pacemaker-2.1.rng is in pacemaker-common 1.1.14-2ubuntu1.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | <?xml version='1.0' encoding='UTF-8'?>
<grammar xmlns='http://relaxng.org/ns/structure/1.0' datatypeLibrary='http://www.w3.org/2001/XMLSchema-datatypes'>
<start>
<element name='cib'>
<externalRef href="cib-1.2.rng"/>
<element name='configuration'>
<interleave>
<externalRef href="options-1.0.rng"/>
<externalRef href="nodes-1.3.rng"/>
<externalRef href="resources-1.3.rng"/>
<externalRef href="constraints-2.1.rng"/>
<externalRef href="fencing-1.2.rng"/>
<externalRef href="acls-2.0.rng"/>
<externalRef href="tags-1.3.rng"/>
</interleave>
</element>
<element name='status'>
<externalRef href="status-1.0.rng"/>
</element>
</element>
</start>
</grammar>
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