tests/documents/sample_4.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE data SYSTEM "abcd.dtd">
<p:data xmlns:p="urn:x" z=">">
    <!-- abcd &lt; &gt; &amp; -->
    <a>test</a>
    <b>kkss" = ddd' ></b>
    <![CDATA[
            <a>ddddd</b>!e3--><!-- ddckx
    ]]>
    <c/>
    <![CDATA[
    <![CDATA[zzzz]]]]><![CDATA[>]]>
</p:data>