IllegalElement.xml

<?xml version="1.0" encoding="utf8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">

<!-- The dtd requires a properties root, but not element -->

<properties>
<comment>comment</comment>
    <properties>
        <entry key="firstKey">value of the first key</entry>
    </properties>
</properties>