At many places in midPoint we can (and sometimes have to) specify queries in order to find one or more objects in the system. We do this e.g. when we want to restrict objects (like users, roles, resources or services) shown on the screen, when selecting objects that are to be included within a report, when specifying objects that are to be processed by a background task, when account owner is to be determined, or when assignment target is to be found. All of this is done via midPoint query language – abstract XML-based language that is designed to specify constraints on objects, and optionally paging and sorting instructions. This language is very powerful. The negative side of that power is complexity: it is quite hard to write (correct) queries by hand. Because of this, we’ve recently added a simple, yet helpful feature to midPoint: query playground.

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