XML

You can find some preliminary GPL'd DTDs at XML/DTD.

Useful in building Consumerium:

• XML Based Signing http://www.w3.org/Signature/
• XML Based Encryption http://www.w3.org/Encryption/2001/
• XML Key Management http://www.w3.org/2001/XKMS/ (Working Group)
• XACML (eXtendable Access Control Mark-up Language) from http://www.oasis-open.org/
• GML (Geography Markup Language) from http://opengis.net/gml/01-029/GML2.html
• SVG (Scalable Vector Graphics)

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Otherwise Interesting

• RSS for your information overdosage needs.
• OPML for exchanging collections of RSS feeds

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External links:

• http://www.w3.org/