v3.0.0+
| Status: | effective |
| Progress: | 100% |
| Version: | 3.0.0+ |
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:
| Name | Description | Help page | Since | Key |
|---|---|---|---|---|
| Allows value | Lists one permissible value for a property | Special property "Allows value" | 1.0 | _PVAL |
| Corresponds to | Gives the conversion factor for some unit of a physical quantity and the possible names for that unit | Special property "Corresponds to" | 1.0 | _CONV |
| Display units | Specifies the a comma-separated list of units or formats that a property should use in display | Special property "Display units" | 1.0 | _UNIT |
| Equivalent URI | Marks a page in the wiki as having a well-known meaning beyond this wiki, in an external URI | Special property "Equivalent URI" | 1.0 | _URI |
| Has type | Assigns a datatype to a property | Special property "Has type" | 1.0 | _TYPE |
| Imported from | Allows users to reuse elements of external vocabularies directly within the wiki | Special property "Imported from" | 1.0 | _IMPO |
| Provides service | Adds service links to properties | Special property "Provides service" | 1.0 | _SERV |
| Subproperty of | Lets you indicate that one property is a subproperty of another | Special property "Subproperty of" | 1.0 | _SUBP |
| Has fields | Defines a short list of fields with a fixed type and order for datatype Record | Special property "Has fields" | 1.5.0 | _LIST |
| Subcategory of | Lets you explicitly indicate that one category is a subcategory of another | Special property "Subcategory of" | 1.5.0 | _SUBC |
| Has subobject | Holds the subobjects set on a page | Special property "Has subobject" | 1.7.0 | _SOBJ |
| Query depth | Holds the value of the property depth of a query | Special property "Query depth" | 1.8.0 | _ASKDE |
| Query format | Holds the name of the result format used in a query | Special property "Query format" | 1.8.0 | _ASKFO |
| Query size | Holds the value of the number of conditions in a query | Special property "Query size" | 1.8.0 | _ASKSI |
| Query string | Holds the conditions of the query as a string | Special property "Query string" | 1.8.0 | _ASKST |
| Query duration | Holds the value of the duration a query took to execute | Special property "Query duration" | 1.9.0 | _ASKDU |
| MIME type | Holds the MIME type of an uploaded file | Special property "MIME type" | 1.9.1 | _MIME |
| Media type | Holds the Media type of an uploaded file | Special property "Media type" | 1.9.1 | _MEDIA |
| Allows pattern | Pattern to match a permissible value | Special property "Allows pattern" | 2.4.0 | _PVAP |
| Display precision of | Allows to define the display precision in digits | Special property "Display precision of" | 2.4.0 | _PREC |
| Has property description | Adds localizable context help to properties | Special property "Has property description" | 2.4.0 | _PDESC |
| Has uniqueness constraint | Allows to restrict value annotation to be unique | Special property "Has uniqueness constraint" | 2.4.0 | _PVUC |
| Language code | Handles BCP47 conform language codes specifying the language of the annotated text | Special property "Language code" | 2.4.0 | _LCODE |
| Allows value list | Adds a reference to a list of permissible values for a property | Special property "Allows value list" | 2.5.0 | _PVALI |
| External formatter URI | Declares an external URL with a place holder $1 | Special property "External formatter URI" | 2.5.0 | _PEFU |
| External identifier | Specifies an external identifier | Special property "External identifier" | 2.5.0 | _PEID |
| Has preferred property label | Adds localizable labels to a property | Special property "Has preferred property label" | 2.5.0 | _PPLB |
| Is edit protected | Stores the status of an edit restriction of a page | Special property "Is edit protected" | 2.5.0 | _EDIP |
| Query parameters | Holds the parameters a query used to select its output | Special property "Query parameters" | 2.5.0 | _ASKPA |
| Query source | Holds the identifier of an alternative (e.g. remote) query source | Special property "Query source" | 2.5.0 | _ASKSC |
| Change propagation | Holds the new property specification of a property or category page | Special property "Change propagation" | 3.0.0 | _CHGPRO |
| Is property group | Property to identify a group category and to support a simple grouping feature in Special:Browse | Special property "Is property group" | 3.0.0 | _PPGR |
| Query state | Holds the status code a query uses to define its internal state | Special property "Query state" | 3.0.0 | _ASKCO |
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".
