XML
You can find some preliminary GPL'd DTDs at XML/DTD.
Useful grammars 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)
Grammars that should be made interoperable by XSLT transformations in CIUML
- Market Data Definition Language (MDDL) is used to describe financial market phenomena and interchange data between market participants. This seems to be it's way to becoming an industry standard. It uses the following standards in it's markup.
- EAN.UCC Global Data Dictionary is an attempt to standardise XML business messages. This initiative doesn't seem very active lately
XML data sources
- GEPIR @ http://www.gepir.org (Gateway to searching EAN, SSCC, GLN)