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Placing New information in DNS: Reuse existing Type
TXT may appear as the obvious choice
No semantics
RFC 1464 subtyping
prefixing could help, but has its own problems
TXT wastes space, this is still important
If new RRset is large you want EDNS0 support
Modern software does this and unknown types as well!!!!
MORAL: Fight for local upgrades, do not force the whole Internet to work around your local issues.
PPT Version