<?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>
      <ref name="attribute-score"/>
  </start>
 
  <define name="attribute-score">
    <attribute name="score">
      <choice>
        <data type="integer"/>
        <value>INFINITY</value>
        <value>+INFINITY</value>
        <value>-INFINITY</value>
      </choice>
    </attribute>
  </define>
</grammar>