<!DOCTYPE TriX [
        <!ENTITY xxe SYSTEM "external-file-nonexistent.txt" >
        ]>
<TriX>
    <graph>
        <triple>
            <uri>http://example.org/Bob</uri>
            <uri>http://example.org/name</uri>
            <plainLiteral>&xxe;</plainLiteral>
        </triple>
    </graph>
</TriX>