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Predicate element can be dropped fromm palette. Once dropped from palette , it appears with 1 input field named "node set". Input field is allowed to be connected only to source tree node. When input field was connected to source node tree, new input fields appears for each location step of element, connected to "Node set" input field. For example, when /bar/foo/name node was connected to "Node set" field, 3 input field will appear on this methoid named "Filter for bar", "Filter for Foo", "Filter for Name". These input fields define filtering expressions for predicates at each location step.
Still have no decision how this feature should be implemented, reassigning for future release.
Predicates are shown in the source tree. They can be added and deleted. Editing of predicates is not supported. Predicates can be edited in the source view. This version is a bit raw. I'm going to improve it a bit later.