xpath query conditional test comparing 2 numeric values

Question

can someone explain to me why this condition return false in this following xpath query

xml

<?xml version="1.0" encoding="UTF-8"?>
<a>ha</a>

xpath query

count(//a) return 1.

but

test="(count(//a) > 0)" return false?

Thank you

Answer 1

In the query

test="(count(//a) > 0)"

test refers to a child element of the document node called "test". If there is no such element (which is the case here), then you are comparing an empty set to the string "count(//a) > 0". Comparing an empty set to anything returns false.