Property:Has type

"Has type" is a predefined property that describes the datatype of a property and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.

Latest revision as of 22:56, 11 September 2011

has type is a special property in Semantic MediaWiki with a built-in meaning: it assigns a type to a property. Special:Types lists the types available in the wiki. See datatypes in the Help system. For example, the page for Property:Title would specify [[has type::String]]. "Has type" assumes its value is in the Type namespace, so you can omit Type:.

Note that you can't perform a semantic search for articles with this special property. Instead, use the special Properties page which gives the type of each property in use; or the special "All Pages" page to display all articles in the Property namespace.

SMW 1.0 allows many-valued properties. You specify this by listing multiple types as the value of Has type, separated by semicolons. For example, on sandbox.semantic-mediawiki.org Property:Employment takes a link to a company, a job title, and a start and end date, so it specifies its type as [[has type:=Page; String; Date; Date]].

Usage44Improper assignments2

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Filter<p>The <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Property_page/Filter">search filter</a> allows the inclusion of <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Query_expressions">query expressions</a> such as <code>~</code> or <code>!</code>. The selected <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Query_engine">query engine</a> might also support case insensitive matching or other short expressions like:</p><ul><li><code>in:</code> result should include the term, e.g. '<code>in:Foo</code>'</li></ul><ul><li><code>not:</code> result should to not include the term, e.g. '<code>not:Bar</code>'</li></ul>

Showing 20 pages using this property.

A

Acquired date +

Date +

C

Coordinates +

Geographic coordinates +

D

Description +

Text +

H

Has building number +

Text +

Has callsign +

Text +

Has committee position +

Page +

Date +

Text +

Text +

Date +

Text +

Text +

Text +

Text +

Boolean +

Text +

Page +

Has minimum people required +

Text +

Has name +

Text +

Has old callsign +

Text +

Showing 2 related entities.

M

Property:Memory +

S

Property:Surface area +

@@ Line 4: / Line 4: @@
 [[Special:Types]] lists the types available in the wiki.
 See [[Help:Properties_and_types#Datatypes|datatypes in the Help system]].
-For example, the page for [[Property:Sowndns]] would specify <tt><nowiki>[[has type::String]]</nowiki></tt>.  "Has type" assumes its value is in the Type namespace, so you can omit ''Type:''.
+For example, the page for [[Property:Title]] would specify <tt><nowiki>[[has type::String]]</nowiki></tt>.  "Has type" assumes its value is in the Type namespace, so you can omit ''Type:''.
 Note that you can't perform a semantic search for articles with this special property. Instead, use the [[Special:Properties|special Properties page]] which gives the type of each property in use; or the [[Special:Allpages|special "All Pages" page]] to display all articles in the Property namespace.