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XSLT 1.0 reference

XSLT  |  functions

boolean() | ceiling() | comment() | concat() | contains() | count() | current()& | document() | element-available() | false() | floor() | format-number() | function-available() | generate-id() | id() | key() | lang() | last() | local-name() | name() | namespace-uri() | node() | normalize-space() | not() | number() | position() | processing-instruction() | round() | starts-with() | string() | string-length() | substring() | substring-after() | substring-before() | sum() | system-property() | text() | translate() | true() | unparsed-entity-uri() |


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

XSLT 1.0 reference