Name
progn — Calculates all given expressions and returns the result produced by the last one.
Synopsis
any
progn
(
|
expn1 any , |
| expn2 any , | |
| ... , | |
expnN
any
); |
Description
This function calculates its first argument, then second argument and so on. The results of these calculations are not used, except the result of the last expression which is returned. The only useful application for this function is calling XPath extension functions for side effects.
This function is not a part of library of standard XQuery 1.0 functions.
Parameters
expn1, expn2, ... expnN
Expressions to be calculated.
Return Types
Any (according to the type of
expnN
)
Examples
Example 24.614.
[xmlns:fileio='http://www.example.com/file-io']
if (function-available ('fileio:printf'),
progn (
fileio:open('greeting.txt', 'wt'),
fileio:printf('Hello %s', /userinfo/name),
fileio:close(),
'File greeting.txt saved' ),
'File greeting.txt not saved' ) )