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Bruce Cantor

Subject: Xquery update support?
Author: Bruce Cantor
Date: 29 Mar 2023 01:56 PM

Hi

Can anyone tell me if xquery updates is supported on the pipeline server?

The scenario is that I have an XML document where I only need to change a couple of values (for a known element).

In xslt I would create a template and use the identity template to copy everything else.

But in xquery, I am unsure how do this without having to rewrite the full input document again.

Your help is much appreciated.

kind regard
Bruce

Ivan Pedruzzi

Subject: Xquery update support?
Author: Ivan Pedruzzi
Date: 29 Mar 2023 05:28 PM

See example below for how to use a similar approach to the XSLT identity transform.

Function local:filter is where you can write your logic for altering the content.

Ivan Pedruzzi
Stylus Studio Team

declare namespace i = "urn:my-nice-namespace";

declare variable $test-input :=
<i:root xmlns:i="urn:my-nice-namespace">
<i:car make="Ferrari" model="PuroSangue">
<i:engine type="V12" volume="6,496"/>
</i:car>
</i:root>;

declare function local:filter($node as element()) as node()?
{
if ( fn:namespace-uri($node) = 'urn:my-nice-namespace'
and fn:local-name($node) = 'car'
and $node/@make = 'Ferrari'
and $node/@model = 'PuroSangue') then

element {name($node)} {
$node/@*, (: Copy all attributes :)

attribute {"revealed"} {"2022-09-13"}, (:add an extra attribute:)

for $child in $node/node()
return local:identity-transform($child) (: Recursive call on child nodes :)
}

else ()
};

declare function local:identity-transform($node as node()) as node()*
{
if ($node instance of element()) then
let $filter := local:filter($node)
return
if (not(fn:empty($filter))) then $filter
else
element {name($node)} {
$node/@*, (: Copy all attributes :)
for $child in $node/node()
return local:identity-transform($child) (: Recursive call on child nodes :)
}
else if ($node instance of attribute()) then
attribute {name($node)} {string($node)}
else $node (: Copy all other nodes unmodified :)
};

declare option ddtek:serialize "indent=yes";

local:identity-transform($test-input)

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