Merge pull request #2 from rmculpepper/0fe169f49dca5cc9c2dc24ed566501929a798e84

more changes
serialization can accept path-strings. Includes doc change & test
added note about tags-that-should-not-be-abbreviated
Merge branch 'master' of github.com:jbclements/sxml
oops info.rkt change
added docs for sxml:document
Converting to new package format
Merge pull request #3 from jeapostrophe/master

Converting to P2
added warnings about eq? subtrees
Merge remote-tracking branch 'clements/master'