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XPath 1.0 reference

XPaths  |  functions

boolean | ceiling | comment | concat | contains | count | false | floor | id | lang | last | local-name | name | namespace-uri | node | normalize-space | not | number | position | processing-instruction | round | start-with | string | string-length | substring | stubstring-after | substring-before | sum | text | translate | true |


boolean

boolean boolean(object)

The boolean function converts its argument to a boolean as follows: a number is true if and only if it is neither positive or negative zero nor NaN, a node-set is true if and only if it is non-empty, a string is true if and only if its length is non-zero an object of a type other than the four basic types is converted to a boolean in a way that is dependent on that type

Locate in the official documentation

XPath 1.0 reference