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GRDDL'ing the target graphical format file would produce some of the RDF that went into the visualization.
http://www.w3.org/TR/grddl-primer/#spreadsheets-section shows to use the following markup so that GRDDL agents can trigger and extract the RDF:
<BLAH xmlns:grddl="http://www.w3.org/2003/g/data-view#" grddl:transformation="https://raw.github.com/timrdf/vsr/master/src/xsl/grddl/graffle.xsl"