Property:Query source

Change propagation updates are pending (50 jobs estimated) and it is recommended to wait with modifications to a property until the process has been finalized to prevent intermediary interruptions or contradictory specifications.

"Query source" is a predefined property provided by Semantic MediaWiki that identifies alternative (e.g. remote, federated) query sources. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.