Re: The exact meaning of a 'global identifier' (itemid)

"...So, if your document lives at the "global
identifier" will be"
1] So this because this is simply how it works then or because that's how treats itemid?
Now I'm not being a smartass here, I just really want to understand how
this is treated from a POV

> "...all properties would be merged so that you end up with a single
> item..."

2] That's what I thought as well. Which is supported by the fact the
structured data linter resolves it this way. But both Google's and Yandex's
SDTT don't and there is no info I could find on how the sponsors look at
it. So inconclusive data VS no documentation; What am I to believe for

2014-06-09 21:50 GMT+02:00 Markus Lanthaler <>:

> On Monday, June 09, 2014 9:29 PM, Jarno van Driel wrote:
> > But what about the two entities with the same @itemid?
> >
> > And what about fragment identifiers (#), how does look at
> > those?
> The value of itemid will always be resolved against the base URL. So, if
> your document lives at the "global
> identifier" will be
> > The Microdata spec says "...It is up to such specifications to define
> > whether multiple items with the same global identifier (whether on the
> > same page or on different pages) are allowed to exist, and what the
> > processing rules for that vocabulary are with respect to handling the
> > case of multiple items with the same ID."
> Well, that says it all, doesn't it? From a Microdata perspective, it is
> undefined. states [1] that the datamodel is derived from RDF
> Schema. I interpret that as " is based on RDF's data model". In
> RDF, "multiple items with the same global identifier" do not exist, they
> are all the same "item" (resource) [2]. So, if you use the same itemid for
> different items, all properties would be merged so that you end up with a
> single item. Obviously I don't know for sure what search engines do
> internally with such data but I assume that's what they do.. especially
> since RDFa and JSON-LD are supported as well and they work exactly this way.
> [1]
> [2]
> --
> Markus Lanthaler
> @markuslanthaler

*Jarno van Driel*
Technical & Semantic SEO Consultant
8 Digits - Digital Marketing Technologies

Tel: +31 652 847 608

Received on Monday, 9 June 2014 21:14:15 UTC