"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.

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:Population would specify [[has type::Number]]. "Has type" assumes its value is in the Type namespace, so you can omit the prefix Type:.

Since version 1.0, SMW allows many-valued properties. Types for these properties are specified by listing multiple types as the value of Has type, separated by semicolons. For example, on 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]].

This documentation page applies to all SMW versions from 1.0 to the most current version.

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