It also addresses some of the more obvious metadata gaps of XML version 1.0 DTDs. Though of course XML DTDs may be migrated or replaced at some point after XML Schema is ratified. XML Schema as a solution Odds are good that a World Wide Web Consortium recommendation for XML Schema will be accepted this year. It describes key metadata characteristics, including base datatypes and corresponding facets. This came from Microsoft, ArborText, DataChannel, Inso, and the University of Edinburgh.
Facets are single defining aspects of concepts or objects.
I think of facets as attributive characteristics of other characteristics. Non-fundamental facets include length, maximum length, pattern, and enumeration. Easier migration At a more practical level, XML Schema uses XML syntax, which avoids the separate language format of a DTD and potentially eases the process of migration from XML version 1.0. Knowing that XML Schema is probably not far into the future, you need to consider some reasonable period of transition between DTDs and Schema, and a tactical process for migration. It's hard to gauge when this will happen, though.