Thank you! So its a 1-1 relationship. Someone told me that its a 1-many relationship which would have broken all of my API RFC ideas.

The only remaining confusing thing - if "item" entity has a Q number, what would the "query" entity prefix be? :))

On Wed, Mar 6, 2013 at 9:50 AM, Denny Vrandečić <denny.vrandecic@wikimedia.de> wrote:

Yes, every Wikidata page is about one and exactly one entity. There cannot be two entities on one page.

"Bonny and Clyde" is one entity, designing the pair of people.

"Bonny" and "Clyde" each might also be one entity each, and there could be relevant connections between the three entities "Bonny", "Clyde", and "Bonny and Clyde".

2013/3/6 Yuri Astrakhan <yuriastrakhan@gmail.com>

Sk!d, of course if you ask for multiple items, you get multiple items. My question is the difference between MediaWiki concept of a "page", and the wikidata concept of an entity, specifically relating to items and properties (not queries). Are these concepts interchangeable? Is one MediaWiki page the same as one wikidata item, and have one-to-one mapping?

On Wed, Mar 6, 2013 at 9:41 AM, swuensch <swuensch@gmail.com> wrote:

It is wbgetentities requests like: https://www.wikidata.org/w/api.php?action=wbgetentities&ids=Q219937|Q42&format=jsonfm give you two entities Q219937 and Q42.

Sk!d

On Wed, Mar 6, 2013 at 3:35 PM, Yuri Astrakhan <yuriastrakhan@gmail.com> wrote:

During an IRC discussion, I was told that a page in namespace 0 like Q219937 does not necessarily have a one-to-one relationship with an entity like "Bonnie and Clyde".

wbgetentities API call gives this:

"entities": {

    "q219937": {

        "pageid": 214789,

        "ns": 0,

        "title": "Q219937",

        "lastrevid": 7969610,

        "modified": "2013-02-27T09:17:25Z",

        "id": "q219937",

        "type": "item",

        "aliases": {

               ......

How is it possible to have more than one entity in one wiki page titled Q219937, if the entity id is the same as page title? In what cases would it be used? Is that a needed extra complexity?

In the case of Bonnie and Clyde (one wikipage in language A vs two wikipages in B), wikidata can have three entities with links to static redirects, apparently solving the need of one-to-many.

I am only considering item entities (ns:0), since query pages will obviously have more than one entity associated with them.

Thanks!

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