exists
Whether an argument is the empty sequence
Description
The fn:exists function returns true if the sequence contains one or more items; it is the opposite of the fn:empty function. It is often unnecessary to call the fn:exists function because sequences are automatically converted to the effective boolean value where a boolean value is expected.
Parameters |
Description |
|---|---|
arg:string() |
Examples
XPath |
Results |
|---|---|
exists( (‘a’, ‘b’, ‘c’) ) |
true |
exists( ‘’ ) |
true |
exists( () ) |
false |
exists( false() ) |
true |