w3c-testcases/w3c/xmlschema2006-11-06/msData/regex/reA45.xml

<?xml version="1.0"?>
<doc  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
    xsi:noNamespaceSchemaLocation='reA45.xsd' >

<!-- 
base='string', pattern='       a|b      ', value='a', type='valid', RULE='1'
-->

      <elem att='       a'/>

 </doc>