-- plain tag
#note3
-- two tags
#note3 #bug

-- simple hierarchy
#note3 > #todo
-- hierarchy with two tags left
#note3 #wovin > #todo
-- deep hierarchy
#note3 >> +todo

-- simple OR
#note3 OR #todo3
-- simple AND
#note3 AND #todo3

-- AND with parens (bug)
(+bookr +todo OR +bookr >> +todo) AND +todo/doing