RDF Syntax: cons

RDF/XML: need an extra data structure for the graph
Data structure not really a graph (yet)

Need a way to point to parts of documents which don't necessarily have an ID: XPointer

     <rdf:Description rdf:about="#emma(id('int1')/date)"> 
        <emma:absolute-timestamp
         emma:start="2003-03-26T0:00:00.15"Z
         emma:end="2003-03-26T0:00:00.2"/> 
     </rdf:Description>

RDF edge case: all node URIs are transient, reification