<catalog prefer="system" xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
  <rewriteSystem systemIdStartString="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" rewritePrefix="xhtml1-strict.dtd" />
  <rewriteSystem systemIdStartString="http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd" rewritePrefix="xhtml1-frameset.dtd" />
  <rewriteSystem systemIdStartString="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" rewritePrefix="xhtml1-transitional.dtd" />
</catalog>
