Andrew Welch wrote:
Hi Andrew,
> normalize-space($str)
> will return true only if the string contains some none white space
> characters, so empty string '' empty sequence () and whitespace only
> ' ' will all return false.
More precisely, the function will return a string of length zero for
each of those cases, the effective boolean value of which (e.g. when
used in the condition clause of an if instruction) is false.
normalize-space(())
==> ''
normalize-space('')
==> ''
normalize-space(' ')
==> ''
fn:boolean('')
==> false
fn:boolean(' ')
==> true
if ( C ) then T else F
if ( fn:boolean(C) ) then T else F
>> both are equivalent
if ( '' ) then 1 else 0
==> 0
if ( ' ' ) then 1 else 0
==> 1
Regards,
--
Florent Georges
http://fgeorges.org/
http://h2oconsulting.be/
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