Simple set expressions define the set of objects that provides the initial scope of the query. You apply transforms and value expressions to the result of the simple set expression to traverse the object graph to retrieve the set of objects you want.
Sometimes the simple set expression is just a constant.
When you are searching from a particular type, the simple set is the name of the type as a string,
and you apply the
value expression to get the type object, and go from there.
The other simple set expressions are listed in this section.
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