Universal-storage/server/rngs/error.rng

<grammar xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  
  <define name="error">
    <element name="error">	  
      <zeroOrMore>
        <element name="reason"><text/></element>
      </zeroOrMore>
    </element>
  </define>
</grammar>