[whatwg] Microdata feedback
philipj at opera.com
Tue Jul 12 07:17:17 PDT 2011
On Tue, 12 Jul 2011 09:41:18 +0200, Henri Sivonen <hsivonen at iki.fi> wrote:
> On Thu, 2011-07-07 at 22:33 +0000, Ian Hickson wrote:
>> The JSON algorithm now ends the crawl when it hits a loop, and replaces
>> the offending duplicate item with the string "ERROR".
>> The RDF algorithm preserves the loops, since doing so is possible with
>> RDF. Turns out the algorithm almost did this already, looks like it was
> It seems to me that this approach creates an incentive for people who
> want to do RDFesque things to publish deliberately non-conforming
> microdata content that works the way they want for RDF-based consumers
> but breaks for non-RDF consumers. If such content abounds and non-RDF
> consumers are forced to support loopiness but extending the JSON
> conversion algorithm in ad hoc ways, part of the benefit of microdata
> over RDFa (treeness) is destroyed and the benefit of being well-defined
> would be destroyed, too, for non-RDF consumption cases.
I don't have a strong opinion, but note that even before this change the
algorithm produced a non-tree for the "Avenue Q" example  where the
"adr" property is shared between two items using itemref. (In JSON, it is
flattened.) If we want to ensure that RDF consumers don't depend on
non-treeness, then this should change as well.
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