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→Query Execution
{{Mark|Introduced with Version 8.4}}: <code>%rest:single</code> annotation.
In many RESTXQ search scenarios, input from browser input forms is processed, and search results are returned. User experience can generally be made more interactive if an updated search request is triggered with each key click. However, such search patterns may lead to numerous parallel requests, from which only the result of the last request will be relevant for the client.
With the <code>%rest:single</code> annotation, it can be enforced that only one instance of a function will be executed for the same client. If the same function will be called for the second time, the already running query will be stopped, and the HTTP error code {{Code|410}} (Gone) will be returned instead:
