test/relaxng/pattern3.rng

<?xml version="1.0"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0"
datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <start>
    <element name="test">
    <data type="token">
    <param name="pattern">[a-z]+</param>
    </data>
    </element>
  </start>
</grammar>