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It would be quite helpful if there would be a documentation on the meta and fs objects on which custom searches in SA and the QueryAgent rely.
Figuring out potential parameters by Drag & Drop of items, searching the Community and the API and still not having found all potential parameters is quite annoying and wastes project time.
Just as a note to this idea: The meta prefix refers to the meta data of elements in FirstSpirit. This is analogue to the data prefix, except that the data prefix may be omitted. These cannot be documented further, as the fields for meta and data are defined within the project itself.