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BTW, a better URL for your resturant guide is:
http://www.crosscheck.com/YARRI/zegats/guide.html.
Yes, we need to provide support for more structured
kinds of annotations, other than free-form text.
The main difficulty is that the semantics of that
data needs to be defined. How should clients deal
with a rating value, for example? "What are all these other fields
or substructures or binary data?" it might say.
It is, in general, a database problem, with all the problems
of defining semantics and mappings between schemas or
ontologies.
The structure of data is easy to define. The semantics
is always a hard problem. We need something on the order
of downloadable code that comes along with data to
help interpret it.
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Structured data is fine 
Restaurant guide metaphor: more than annotation, creation
(Douglas Yarrington)
