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Wikidata in its first phases has two main goals: to centralize interlanguage links across Wikimedia projects and to serve as a general knowledge base for the world at large. An item is acceptable if and only if it fulfills at least one of these two goals, that is if it meets at least one of the criteria below:

  1. It contains at least one valid sitelink to a page on Wikipedia, Wikivoyage, Wikisource, Wikiquote, Wikinews, Wikibooks, Wikidata, Wikispecies, Wikiversity, or Wikimedia Commons.
    1. To be valid, a link must not be a talk page, MediaWiki page, special page, file, translations page, pages in User or Draft namespace, pages used by LiquidThreads (i.e. pages in Thread and Summary namespace), pages used by Structured Discussions (i.e. pages in Topic namespace), subpages of Portal namespace, or any pages that are intended for TemplateStyles (i.e. suffix that contain ".css" and/or ".js").[1][2][3][4][5] Note that a single Wikimedia page cannot have more than one sitelink in Wikidata. It is permitted for a sitelink to point to a redirect (although the software intentionally makes this difficult),[6] but such a link will not count towards establishing notability.
    2. If a link is a template, the item must contain at least two such sitelinks, and any of them must not be one of /doc, /XML, /meta, /sandbox, /testcases or /TemplateData subpages. Items for non-subpages can be created with 1 sitelink, but shouldn't be created in great numbers.
    3. If a link is a subpage of a module, it must not be a /doc page.[7]
    4. Category items with a sitelink only to Wikimedia Commons are not permitted, unless either a) there is a corresponding main item which has a sitelink to a Commons gallery or b) the item is used in a Commons-related statement, such as category for pictures taken with camera (P2033).
    5. On Wikisource, items for mainspace pages, Author pages, Translation pages, and Portal pages are valid, along with items for namespaces that exist on other Wikimedia sites (Category, Project...). Pages in the Index and Page namespaces are not considered valid. The status of subpages of mainspace pages (for example, individual chapters) is undetermined.[8]
    6. On Wikinews, pages in the Comments namespace are not considered valid.
    7. On Wikidata, items and properties are not allowed as target sitelink.
    8. On Wiktionary, items for citation pages are not allowed. Main namespace is also excluded because interlanguage links are automatically provided by Cognate.
  2. It refers to an instance of a clearly identifiable conceptual or material entity. The entity must be notable, in the sense that it can be described using serious and publicly available references.
  3. It fulfills a structural need, for example: it is needed to make statements made in other items more useful.

See also

References

  1. Request for comment: Inclusion of non-article pages
  2. Request for comment: Inclusion of non-article pages 2
  3. Request for comment: Exclusion of pages in the file namespace
  4. Drafts are excluded per Wikidata:Project chat/Archive/2013/12#Draft name space and Wikidata:Project chat/Archive/2014/05#What do do with Wikipedia:Draft articles.
  5. consensus to exclude TemplateStyles related subpages
  6. Wikidata:Requests for comment/Allow the creation of links to redirects in Wikidata (2017-18) confirming older Wikidata:Requests for comment/A need for a resolution regarding article moves and redirects#new Proposal zero (2013).
    A redirect can be sitelinked by temporarily turning it into a regular page (eg by removing the initial '#' from the '#REDIRECT' line in the wikitext of the Wikipedia page), then adding a sitelink in Wikidata to the Wikipedia page, then restoring the '#' to turn the page back into a functioning redirect page again. If available, a template corresponding to Template:Wikidata redirect (Q16956589) should also be added to the redirect page, to show that the Wikidata sitelink is intentional, and not eg the unintended left-over effect of a Wikipedia article merge that should also have been reflected on Wikidata. Sitelinks to redirects should typically not be created unless (a) there is a substantial section about the subject on the target page of the redirect, reflecting all or most of the information in the Wikidata item; and (b) there is good reason not to merge the two corresponding Wikidata items.
  7. Request for comment: Interwiki links for subpages
  8. Discussion: Wikidata talk:Wikisource#Notability, and other preparations for Wikisource deployment