Hello,<br><br>    In some code that I am cabalizing I ran into:<br><br>    type DataLiteral  = &lt;&lt;&lt; ref RDFgraph defs &gt;&gt;&gt;<br>    type URIReference = &lt;&lt;&lt; ref RDFgraph defs &gt;&gt;&gt;<br>    type NonNegativeInteger = &lt;&lt;&lt; ??? &gt;&gt;&gt;<br>
<br>What is this?<br><br>Kind regards,<br><br>Vasili<br>