View source for Template:Get QID/doc

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== Usage ==
This template retrieves the [[WP:Wikidata|Wikidata]] unique identifier (''QID'') that corresponds to the Wikipedia page (or redirection page) title (known in Wikidata terminology as a Wikidata item's ''Wikipedia sitelink'', not to be confused with its ''label'') specified in the first unnamed parameter. If a page is moved, a {{tlp|Get QID|<page title>}} call referring to its former title typically still works, since the template follows the redirection destination, if the redirection source does not have a Wikidata item of its own. If no parameter is given ({{tlp|Get QID}}), it retrieves the QID of the current page. If the qid parameter is defined ({{tlp|get QID|qid=<QID>}}) the template just passes the given value on.

===Current page===
Example:
 <code><nowiki>{{Get QID}}</nowiki></code> &rarr; {{Get QID}}
gives the QID of the current Wikipedia page, or an empty text string if no QID is defined.

===Articles sharing the same label===
The template does not do lookups of a Wikidata label, but of a Wikipedia page title. For example, the following two pages have the same Wikidata label, ''Mars'':
 <code><nowiki>{{Get QID|Mars}}</nowiki></code> &rarr; {{Get QID|Mars}}
 <code><nowiki>{{Get QID|Mars (mythology)}}</nowiki></code> &rarr; {{Get QID|Mars (mythology)}}
The template will return the QIDs of [[Mars (planet)]] and [[Mars (mythology)]] respectively.

===Redirection page===
The page [[universes]] is a redirect to [[universe]], and does not have its own defined Wikidata item:
 <code><nowiki>{{Get QID|universes}}</nowiki></code> &rarr; {{Get QID|universes}}
gives the QID of the page [[universe]].

Usage together with the Q template: 
 <code><nowiki>{{Q|{{Get QID|universes}}}}</nowiki></code>  &rarr; {{Q|{{Get QID|universes}}}}

===Redirection page with its own Wikidata item===
[[Maryport New Lighthouse]] is redirected to [[Maryport Lighthouse]], each having separate Wikidata items:
 <code><nowiki>{{Q|{{Get QID|Maryport New Lighthouse}}}}</nowiki></code> &rarr; {{Q|{{Get QID|Maryport New Lighthouse}}}}

===Passing QID parameter on===
 <code><nowiki>{{Get QID|qid=Q111}}</nowiki></code> &rarr; {{Get QID|qid=Q111}}

===Substitution===
To make Wikipedia faster, and to make the result less vulnerable to future deletion of redirects, this template may be substituted: <code><nowiki>{{subst:Get QID|<page title>}}</nowiki></code>, for example:
 <code><nowiki>{{subst:Get QID|universe}}</nowiki></code> &rarr; Q1 
which is immediately replaced by the resulting QID when saved.
 
However, a purpose of this template is to make the wikicode more comprehensible by avoiding QID codes, which substitution counteracts.

===Other ways of getting the QID===
Invoking these modules may also provide the QID for a certain Wikipedia page title:
 <code><nowiki>{{#invoke:wd|label|raw|page=Mars (mythology)}}</nowiki></code> &rarr; {{#invoke:wd|label|raw|page=Mars (mythology)}}
 <code><nowiki>{{#invoke:WikidataIB|getEntityFromTitle|Mars (mythology)}}</nowiki></code> &rarr; {{#invoke:WikidataIB|getEntityFromTitle|Mars (mythology)}}
but they do not follow redirects.

The following module provides the page title of a redirect destination:
 <code><nowiki>{{#invoke:Redirect|main|Universes}}</nowiki></code> &rarr; {{#invoke:Redirect|main|Universes}}

== See also ==
* {{tl|Area WD}}
* {{tl|Population WD}}
* {{tl|Popdens WD}}
* {{tl|Label}}, the inverse template

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