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SGML and XML
SGML and XML is about putting markup on texts or ASCII data and processing such texts with specialized tools like editors or parsers.
Retrieve update and experimental packages from the XML Tools repository of the openSUSE Build Service--drop a line to keichwa if you would like to participate in improving or enhancing the XML repository.
Darwin Information Typing Architecture (DITA XML) is a topic oriented way of managing documentation. The standard accepted by OASIS (http://www.oasis-open.org). For more info, see http://xml.coverpages.org/dita.html
Old Tools: QWERTZ DTD, linuxdoc, etc.
These are SGML DTDs with special minimization features enabled: