A quick proof of what could be done with the RDF is available in my description of shepherds image
The Name and e-mail fields so that we can track the provenance of the annotations, if you say the resource is a http://xmlns.com/foaf/0.1/Person
or http://xmlns.com/wordnet/1.6/Person
then a name and email field will appear to allow you to create codepiction data. (Well in an appropriately configured and capable browser, otherwise please use the forms within the SVG itself.)