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Using different datatypes, properties can be used to describe very different kinds of values. A complete list of all 0 datatypes provided by Semantic MediaWiki and 0 provided by other semantic extensions is available from special page "Types". The available 0 datatypes are:
In addition to assigning a datatype to a property, you can also restrict the allowed values to a given set (like a whitelist for property inputs). This is done by using the Template:SpecialProperty to enumerate its permitted values. This works for every datatype.
Template:DataType allows a unit after the numeric value to distinguish values (e.g. "30 miles" versus "42 km"). To support automatic conversion and multiple unit formats, one needs to declare each supported unit as described in the documentation on custom units. Property values are then automatically converted between different units, so that users are free to use their preferred unit in each article yet still query and compare with property values in other articles.
| Datatype | Property | Example value | Query display | Query display using #- (plain) |
|---|---|---|---|---|
| Annotation URI | Property:Has annotation uri | https://www.semantic-mediawiki.org | https://www.semantic-mediawiki.org | https://www.semantic-mediawiki.org |
| Boolean | Property:Has boolean | true | true | true |
| Code | Property:Has code | Code
is preserved but variables are expanded, e.g: Help:List of datatypes is displayed as the name of this page instead of FULLPAGENAME |
Code
is preserved but variables are expanded, e.g: Help:List of datatypes is displayed as the name of this page instead of FULLPAGENAME |
Code
is preserved but variables are expanded, e.g: Help:List of datatypes is displayed as the name of this page instead of FULLPAGENAME |
| Date | Property:Has date | 2015-05-22T17:32 | 22 May 2015 17:32:00 | 2015-05-22T17:32:00 |
| External_identifier | Property:Has SMW issue ID | 1218 | 1218 | 1218 |
| Property:Has email address | president@whitehouse.gov | president@whitehouse.gov | president@whitehouse.gov | |
| Geographic coordinate | Property:Has coordinates | 32° 42' 54.00" N, 117° 9' 45.00" W | 32° 42' 54.00" N, 117° 9' 45.00" W | 32° 42' 54.00" N, 117° 9' 45.00" W |
| Keyword | Property:Has keyword | TestKeyword | TestKeyword | TestKeyword |
| Number | Property:Has number | 47000.11 | 47,000.11 | 47000.11 |
| Monolingual text | Property:Has mlt | Monoglingual text in english (en)Einsprachiger Text auf Deutsch (de)Texte monoglinguel en français (fr) | Monoglingual text in english (en), Einsprachiger Text auf Deutsch (de), Texte monoglinguel en français (fr) | Monoglingual text in english (en), Einsprachiger Text auf Deutsch (de), Texte monoglinguel en français (fr) |
| Page | Property:Has example | Semantic MediaWiki | Semantic MediaWiki | Semantic MediaWiki |
| Quantity | Property:Area | 1052km²406.18 sqmi <br /> | 1,052.00 km²406.18 sqmi <br /> | 1052.00 km² |
| Reference | Property:Has Wikidata reference | Q190087;https://en.wikipedia.org/wiki/Data_type | Q190087;https://en.wikipedia.org/wiki/Data type | Q190087;https://en.wikipedia.org/wiki/Data type |
| Record | Property:Has conservation status | Dodo (Extinct, 2012) | Dodo (Extinct, 2012) | Dodo (Extinct, 2012) |
| Telephone number | Property:Telephone number | +1-800-225-5288 | +1-800-225-5288 | |
| Temperature | Property:Has temperatureExample | 23°C296.15 K <br />73.4 °F <br />533.07 °R <br /> | 296.15 K23 °C <br />73.4 °F <br />533.07 °R <br /> | 296.15 K |
| Text | Property:SomeProperty | Did you create the page for Tokyo 東京 ? Yes ✓ | Did you create the page for Tokyo 東京 ? Yes ✓ | Did you create the page for Tokyo 東京 ? Yes ✓ |
| URL | Property:Has_URL | http://www.whitehouse.gov | http://www.whitehouse.gov | http://www.whitehouse.gov |
Up to Template:Release, datatypes had individual wiki pages in their own namespace called "Type". This was abolished to reduce the number of extra namespaces. You may still find expressions like "Type:Number" in places in this wiki. Both writings are accepted for assigning a datatype to a property.
In very early versions of SMW up to Template:Release, properties with datatype Template:DataType were known as relations and only those used double colons (::) as the separator between property name and link text. All other properties (numbers, text, etc.) were known as attributes and had to use colon equals (:=) as the separator.
See Upgrading from SMW 0.7 to SMW 1.0 for other changes in SMW 1.0; if you're still using the older version of SMW, see semweb:Help:Annotation (SMW0.7) for documentation of Annotations in version 0.7.