so the test is

no non white space text nodes
all odd element nodes are a (and there are at least three of these
all even element nodes are br

?

p[
not(text() != '') and
not(*[(position() mod 2 = 1) and not(self::a)]) and
(count(a) > 2) and
not(*[(position() mod 2 = 0) and not(self::br)])
]

I think, untested:-)

David


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