Boolean Methods

The boolean method converts the value of object1 to Boolean, and returns true or false.

The exists method checks whether a value is present in object1. If a value is present, it returns Boolean true; otherwise, it returns Boolean false.

The false method always returns Boolean false.

The lang method returns Boolean true if the value of string1 matches the language of the xsl:lang element; otherwise, it returns Boolean false.

The not method returns Boolean true if boolean1 is false, and returns Boolean false if boolean1 is true.

Note: Boolean parameters cannot accept values with capital letters. For example, “True” and “TRUE” are not valid Boolean values, but “true” is.

The true method always returns Boolean true.