Does the w3c have some sort of .jar-like standard for creating svg

bundles that include both a main svg and associated bitmaps and other

linked content all-in-one?  That seems like it would be the ideal

solution.

Not that I know of, but note there's an 'inkjar' functionality buried in

Inkscape itself for handling jar-based file collections.  I believe this

works pretty well, it's just poorly advertised.  If you're interested in

working on this, it could probably benefit from gaining better exposure

in the File menu UI.