Watch this: Webified markup.

This article looks at the trends concerning metadata and Web contents. The design of metadata should be easy for the non-technical scholar to construct, expressive enough to declare the provenance and relationship of resources; and perhaps most importantly, reflects standard information architecture protocols so that conventional application programs can harvest the metadata and re-purpose the Web content. XML or the Extensible Markup Language architecture leverages all the application software built on the protocols of the W3C.