Boolean Functions 

The XML Path Language (XPath) syntax supports Boolean functions that return strings or numbers, and can be used with comparison operators in filter patterns.

Boolean Functions

boolean

Converts the argument to a Boolean.

false

Returns false.

lang

Returns true if the xml:lang attribute of the context node is the same as the argument string.

not

Returns true if the argument is false, otherwise, false.

true

Returns true.
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