Re: Inverse Properties in Microdata:, was Re: schema.org update, v1.8: added WebSite type; broadened isPartOf to relate CreativeWorks

Processors can do that implicitly if it's the same page, but it would help
make that cleaner if we completed the mainEntity (of a page) proposal from
some thread a couple months back.

On Tue Aug 05 2014 at 10:02:18 AM Gregg Kellogg <gregg@greggkellogg.net>
wrote:

> On Aug 5, 2014, at 9:42 AM, Thad Guidry <thadguidry@gmail.com> wrote:
>
> DanBri,
>
> Jarno does have a valid point about itemid lacking some documentation ...
> and I do not see examples or any mention on the getting started page:
> http://schema.org/docs/gs.html which probably should use at least 1
> simple example of itemid usage on it.
>
> BTW, looks like MedicalGuideline has mention of alternative use of itemid
> as an external enumeration:
> https://github.com/rvguha/schemaorg/blob/master/data/examples.txt#L2919
>
>
> I don't really see this as a different use, but "external enumeration" may
> be confusing. Basically, it's saying that when a well known identifier
> exists for an entity, that it is best to use it; this is a basic principle
> of Linked Data. In this case, NIH provides identifiers for all (most)
> drugs, so is a natural place to find such identifiers. Other places are
> DBpedia, Wikidata and Freebase. Many would like to mint their own
> identifiers (due to perceived issues of stability and control), which can
> be accommodated using sameAs to associate a local identifier with one or
> more external entities which are intended to be the same thing
>
> IMO, the schema.org examples have long de-emphasized the usefulness of
> uniquely identifying items (nodes) in a graph, so that the use of @itemid
> remains confusing. I'd rather see more pervasive use of @itemid in such
> examples.
>
> For example, the examples for WebPage really should use @itemid="", as
> that certainly identifies the page which is being described! Instead, the
> use of "structure" within a document is emphasized, which is then divorced
> of linked context.
>
> Gregg
>
> --
> -Thad
> +ThadGuidry <https://www.google.com/+ThadGuidry>
> Thad on LinkedIn <http://www.linkedin.com/in/thadguidry/>
>
>
>