4
Background
n SGML DTDs for D. S. D
ä Sperberg-McQueen
ä Others
n Considered for XML itself
n MCF, then RDF, now DCD, by Bray et al.
n XML-Data, two versions, now XML-Data
reduced, by Layman et al., then Frankston and
Thompson
n SOX, from Veo Corp.
n XSchema, from an ad-hoc group of designers