[provenance-challenge] opm2dot - labelling of complex values

[Ben Clifford]

Others might find this technique useful, so I am noting it here.

My swift OPM rendering stores complex XML data in the <value> elements 
(ultimately, very complex, I expect) of processes and artifacts.

The opm2dot utility seems to expect the <value> to be a string. I am able 
to preprocess my OPM XML to someting opm2dot will render using an xslt 
stylesheet and piping my OPM output through xsltproc, allowing me to 
condense my complicated XML into a summary string value.

$ xsltproc ./opm2dot.xslt opm.xml  >copy.xml 
$ opm2dot copy.xml copy.dot copy.pdf

http://www.ci.uchicago.edu/~benc/tmp/opm2dot.xslt

I do this because I want my official OPM XML to contain this complex 
information, and want to keep that separate from the dot-based 
presentation.

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