"Wikibase is open-source software for creating collaborative knowledge bases, opening the door to the Linked Open Data web." Wikibase. Wikidata is an Instance of Wikibase. #semanticClimate team has set up a Wikibase Instance for IPCC Reports.
Wikibase defines Items. An Item is any object which can be precisely identified and given a permanent unique identifier. In IPCC Wikibase, for example, has the unique ID . Every Wikibase item has a page, e.g. .