Help:Special:UnusedProperties

UnusedProperties is a special page that lists all described properties, i.e. properties that have an explicit datatype assigned to them using special property "Has type" but are no longer having a value assignment (annotation) on any wiki page. This special page was introduced in Semantic MediaWiki 0.3 as special page "UnusedAttributes" and was renamed to its current name presumably starting with Semantic MediaWiki 1.0.

While gardening the semantic data of the wiki all properties listed on this special page may be deleted.

Semantic MediaWiki 1.9.0 introduced the "rebuildPropertyStatistics.php" maintenance script allowing to update the statistical data on this special page. i.e. determine if a property is used or not. These data are no longer automatically updated by Semantic MediaWiki since. This avoids using an active connection to the data store thus improving the performance of the wiki. However after running the maintenance script the information displayed on this special page is not immediately updated. This may take up to one hour if the default settings for the  configuration parameter are used.

Starting with Semantic MediaWiki 2.5.0 this special page will no longer show the special properties even if they are not used, i.e. if no value assignments (annotations) to them exist.CiteRef::gh:smw:2182 Since they are provided by Semantic MediaWiki either way they cannot be cleared when gardening the respective wiki.

Semantic MediaWiki 2.5.0 also brings a new search form using autocompletion for search suggestions to this special page. Note that when using this search form the results are using the lookup cache for performance reasons too which is also governed by the  configuration parameter.