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040000 tree 1a254ea08ad2e8a7e40d604e8ff095b185d45c78	selector
040000 tree b415cdff29b100ba005563ba4e3876d18f1d3358	transformer
040000 tree 08e84ccf6f12921b979abf0017a7f1daaaf96a87	traverser
040000 tree a27afea5b0be46cdbc480f38a4b73005eb6746bc	version
040000 tree 81d2954f075671ea51b16819c1c4cbf9528f5a42	visitor