Help:Property change propagation

Change propagationHelp:Property change propagation
Property type change propagation
Activities and requirements while the change propagation is underway
Missing value assignments while type change propagation is underway

The change of a property's datatype will initiate a change propagation process on all dependent entities that have a value assigned for the altered property and will temporary (after the change) appear with an unassigned value while the job queue is working its way through the backlog. Depending on the size and rate of executable jobs, the update may take a moment before all queries can display the newly assigned value.

The reason for this process is that each datatype is described by certain display characteristics (e.g datatype "Date"Holds particular points in time vs. datatype "URL"Holds URIs, URNs and URLs) and value constraints and with it influences a property's fundamental specification therefore a change propagation ensures that an altered property notifies all entities with a value assignment in order to be updated in due time.

The approach on how changes are propagated has been revised with Semantic MediaWiki 3.0.0Released on 11 October 2018 and compatible with MW 1.27.0 - 1.31.x. 1. This version also brought the tracking of changes to categories when their hierarchy structure is altered and hereby allows related entities to be reevaluated (see special property "Subcategory of"Lets you explicitly indicate that one category is a subcategory of another).2

See also[edit]


  1. ^  Semantic MediaWiki: GitHub issue gh:smw:2494
  2. ^  |  Semantic MediaWiki: GitHub pull request gh:smw:2776