Special properties (visible)

From semantic-mediawiki.org

This help page lists the visible special properties. Visible special properties are viewable by the user via the browsing interfaces of the wiki.

The following table gives an overview of all 35 visible special properties provided by Semantic MediaWiki:

NameDescriptionHelp pageSinceKey
Allows valueLists one permissible value for a propertySpecial property "Allows value"1.0
Corresponds toGives the conversion factor for some unit of a physical quantity and the possible names for that unitSpecial property "Corresponds to"1.0
Display unitsSpecifies the a comma-separated list of units or formats that a property should use in displaySpecial property "Display units"1.0
Equivalent URIMarks a page in the wiki as having a well-known meaning beyond this wiki, in an external URISpecial property "Equivalent URI"1.0
Has typeAssigns a datatype to a propertySpecial property "Has type"1.0
Imported fromAllows users to reuse elements of external vocabularies directly within the wikiSpecial property "Imported from"1.0
Provides serviceAdds service links to propertiesSpecial property "Provides service"1.0
Subproperty ofLets you indicate that one property is a subproperty of anotherSpecial property "Subproperty of"1.0
Has fieldsDefines a short list of fields with a fixed type and order for datatype RecordSpecial property "Has fields"1.5.0
Subcategory ofLets you explicitly indicate that one category is a subcategory of anotherSpecial property "Subcategory of"1.5.0
Has subobjectHolds the subobjects set on a pageSpecial property "Has subobject"1.7.0
Query depthHolds the value of the property depth of a querySpecial property "Query depth"1.8.0
Query formatHolds the name of the result format used in a querySpecial property "Query format"1.8.0
Query sizeHolds the value of the number of conditions in a querySpecial property "Query size"1.8.0
Query stringHolds the conditions of the query as a stringSpecial property "Query string"1.8.0
Query durationHolds the value of the duration a query took to executeSpecial property "Query duration"1.9.0
MIME typeHolds the MIME type of an uploaded fileSpecial property "MIME type"1.9.1
Media typeHolds the Media type of an uploaded fileSpecial property "Media type"1.9.1
Allows patternPattern to match a permissible valueSpecial property "Allows pattern"2.4.0
Display precision ofAllows to define the display precision in digitsSpecial property "Display precision of"2.4.0
Has property descriptionAdds localizable context help to propertiesSpecial property "Has property description"2.4.0
Has uniqueness constraintAllows to restrict value annotation to be uniqueSpecial property "Has uniqueness constraint"2.4.0
Language codeHandles BCP47 conform language codes specifying the language of the annotated textSpecial property "Language code"2.4.0
Allows value listAdds a reference to a list of permissible values for a propertySpecial property "Allows value list"2.5.0
External formatter URIDeclares an external URL with placeholders $1, $2Special property "External formatter URI"2.5.0
External identifierSpecifies an external identifierSpecial property "External identifier"2.5.0
Has preferred property labelAdds localizable labels to a propertySpecial property "Has preferred property label"2.5.0
Is edit protectedStores the status of an edit restriction of a pageSpecial property "Is edit protected"2.5.0
Query parametersHolds the parameters a query used to select its outputSpecial property "Query parameters"2.5.0
Query sourceHolds the identifier of an alternative (e.g. remote) query sourceSpecial property "Query source"2.5.0
Change propagationHolds the new property specification of a property or category pageSpecial property "Change propagation"3.0.0
Is property groupMarks a category for holding properties belonging to a property groupSpecial property "Is property group"3.0.0
Query stateHolds the status code a query uses to define its internal stateSpecial property "Query state"3.0.0

Conversely all special properties not listed here are not visible by the user.

Special property "Subcategory of"Lets you explicitly indicate that one category is a subcategory of another is only a visible special property if option SMW_CAT_HIERARCHY to configuration parameter configuration parameter $smwgCategoryFeaturesSets the behaviour of the query features related to category handling was removed from it".