[microformats-discuss] URIs please!
kmarks at technorati.com
Thu Jul 14 17:57:23 PDT 2005
On Jul 14, 2005, at 5:42 PM, Peter Janes wrote:
> Ryan King wrote:
>> On Jul 14, 2005, at 8:14 AM, Bud Gibson wrote:
>>> 2. The presence of an XMDP cannot practically be assumed to mean
>>> that any occurrence of an attribute value defined in the XMDP is to
>>> be interpreted according to the XMDP's definition.
>> Right, but we're not looking for individual attribute values, we're
>> looking for attribute values in context.
> I don't think it's necessarily true that a microformat will define a
> hierarchy of attribute values. Take rel="nofollow", which defines
> a single value, as an example: there's no structure involved, it is
> significant no matter where it appears in a document. My proposed
> robots-exclusion profile is an even more general case than
> rel="nofollow" since it defines attribute values (class names) that
> can be used on any subset of elements in a document in any combination
> or order.
> (Some may debate that robots-exclusion is a microformat, since even in
> its name it's targeted at crawlers. To those folks I'd note that
> rel="nofollow", which was created entirely for use by spiders, is
> perhaps the most widely-adopted microformat out there; it certainly
> has the most significant industry backing.)
Right, Peter, but there is a difference between an elemental format ,
which defines a single value, and a compound format like hCard.
Validating the existence of an elemental format is easy, as it is a
single value; validating a more complex structure requires parsing.
Also, note the composability of the elements; you can make sense of
rel="tag" within another format, even if you don't necessarily parse
that format fully.
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