Evaluating XPath Expresssions

XPath Result of XPath Evaluation
count(('a', 'b', (), 'c'))
3
('a', 'b', (), 'c')
a b c
count(('a', 'b', '', 'c'))
4
('a', 'b', '', 'c')
a b  c
count((('a', 'b', '', 'c')[.]))
3
('a', 'b', '', 'c')[.]
a b c