boolean
The effective boolean value of a sequence
Description
The fn:boolean function calculates the effective boolean value of a sequence. In most cases it is unnecessary to call this function because the effective boolean value is calculated automatically in many expressions, including conditional and logical expressions, where clauses, and predicates.
Parameters |
Description |
|---|---|
arg:boolean() |
Examples
XPath |
Results |
|---|---|
boolean( () ) |
false |
boolean(‘’) |
false |
boolean(0) |
false |
boolean(‘0’) |
true |
boolean(‘false’) |
true |
boolean(xs:float(‘NaN’)) |
false |
boolean((false(), false(), false())) |
Error FORG0006 |
boolean($ordDoc/order[1]) |
true |
boolean($ordDoc/noSuchChild) |
false |
boolean(<a>false</a>) |
true |