pacemaker/xml/options-1.0.rng

<?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>
    <interleave>
      <element name="crm_config">
        <zeroOrMore>
          <element name="cluster_property_set">
            <externalRef href="nvset.rng"/>
          </element>
        </zeroOrMore>
      </element>
      <optional>
        <element name="rsc_defaults">
          <zeroOrMore>
            <element name="meta_attributes">
              <externalRef href="nvset.rng"/>
            </element>
          </zeroOrMore>
        </element>
      </optional>
      <optional>
        <element name="op_defaults">
          <zeroOrMore>
            <element name="meta_attributes">
              <externalRef href="nvset.rng"/>
            </element>
          </zeroOrMore>
        </element>
      </optional>
    </interleave>
  </start>

</grammar>