tests/data/bad-identifier-entry.xml

<?xml version="1.0" encoding="UTF-8"?>
<protocol name="the_protocol">
  <interface name="the_interface" version="1">
    <description summary="the summary">
    </description>
    <enum name="4the_enum">
      <entry name="60_seconds" value="1" summary="this is the first"/>
      <entry name="invalid entry" value="2" summary="this is the first"/>
    </enum>
  </interface>
</protocol>