I have successfully been able to being the systematic transformation process of EAD and MARC to RDF/XML, and consequently been able to literally illustrate the resulting triples. [1, 2] From the blog posting :
The resulting images are huge, and the astute/diligent reader
will see a preponderance of literals in the results. This is not
a good thing, but it all that is available right now.
On the other hand the same astute/diligent reader will see the
root of the RDF/XML pointing to a meaningful URI. This URI will
be resolvable in the near future via content negotiation. This is
a simple first step. The next steps will be to apply this process
to an entire collection of EAD files and MARC records. After that
the two other things can happen: 1) the original metadata files
can begin to include URIs, and 2) the XSL used to process the
metadata can employ a more standardized ontology. It is not an
easy process, but it is a beginning.
Right now, something is better than nothing.
 EAD illustration- http://sites.tufts.edu/liam/files/2013/12/hou00096.png
 MARC illustration - http://sites.tufts.edu/liam/files/2013/12/003078076.png
 blog posting - http://sites.tufts.edu/liam/2013/12/06/illustrating-rdf/