[whatwg] Micro-data/Microformats/RDFa InteroperabilityRequirement

[Kristof Zelechovski]

The main problem with prefixes is that the meaning of prefixes is not
preserved when a code fragment is pasted elsewhere, so that prefixed names
can end up meaningless or having an entirely different meaning from what the
author had intended.  A similar problem arises with DTD entities (indeed,
DTD entities could be used instead of prefixes).
HTH,
Chris