Special properties (annotable)

This help page lists the annotable special properties. Annotable special properties may be manually annotated by the user on wiki pages.

The following table gives an overview of all 24 manually annotable 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
Allows pattern	Pattern to match a permissible value	Special property "Allows pattern"	2.4.0	_PVAP
Display precision of	Precision in digits	Special property "Display precision of"	2.4.0	_PREC
Display title of	Holds a specific denote title for an entity	Special property "Display title of"	2.4.0	_DTITLE
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

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

Special property "Subcategory of"Lets you explicitly indicate that one category is a subcategory of another is only a manually annotable 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".