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Design principles

Concept: a graphical user interface (GUI) that uses the tree metaphor itself to design the query

The GUI has 2 components, one for specifying topological constraints consisting of the presence or absence of groups in any particularly branching order, and the other for specifying what is returned.

Prior art:

Bill says that PhyloWidget was designed initially with the idea of providing a search interface.

Bill has a paper that is relevant.

Topological constraints component