SVG is DOM, meaning it has a hierarchy of nodes, same as HTML, just as different XML variant.
Any any hierarchy is a "graph", and RDF designed for representing graphs.
So, technically SVG could be a "semantic web" visual graph.
Why? Just because it could be done, I guess :)
Old Dog, New Tricks by Kurt Cagle @ LinkedIn
Expressing SVG (and HTML) as RDF
There are many good use-cases for RDF variants, while SVG may not be one of them...
Visual graphs, expressed in higher-level model, that would be a very good use-case for RDF.
Resource Description Framework - Wikipedia
But RDF itself is already obscure enough, unless used in simplified serialization such as N3.
We may need to use AI to come up with a simpler to use graph representation syntax...