There's SXML, which is equivalent to XML but in S-expression form. Seems to have only caught on in the Scheme community, though. There are a couple standard wa

There's SXML, which is equivalent to XML but in S-expression form. Seems to have only caught on in the Scheme community, though. There are a couple standard ways to do dictionaries (a-lists and p-lists). Object systems like CLOS and GOOPS have standard text representations, but they're tied to their respective Lisps.