XML Related

UISIC XML Group: International Union of Speleology, Informatics Commission XML Working Group

W3C XML: good starting point for Schema (see below), XLink, XPointer and available software.

W3C XML Schemas Page: very good list of tools, tutorials, and the XML Schema specifications.

Cave Survey Software

Survex Cave Surveying Software: An comprehensive set of cave survey software developed by Olly Betts and others. Works on many platforms (Linux, Windows and DOS), data format is ASCII and programs are open source.