Thank you, Christian! The problem is that this way I lose the base URI! The only way how to retain it which I am aware of would be the insertion of @xml:base, but this amounts to a change of the document I may not be authorized to do by the context.  Is there any way how to change a document (as modified copy, not via copy/modify/return) and retain or control the base URI of the result, without inserting @xml:base? Kind regards,Hans-Jürgen Am Montag, 4. August 2025 um 12:49:50 MESZ hat Christian Grün cg@basex.org Folgendes geschrieben:

#yiv8241575627 P {margin-top:0;margin-bottom:0;}Hi Hans-Jürgen, The insertion of namespace nodes has not been defined in the XQuery Update spec. You may need choose the classic element constructor for that: let $doc := <doc><a/></doc>return element { node-name($doc) } {  $doc/@*,  namespace xyz { 'https://basex.org/ns' },  $doc/node()} Hope this helps,ChristianVon: Hans-Juergen Rennau via BaseX-Talk basex-talk@mailman.uni-konstanz.de Gesendet: Samstag, 2. August 2025 15:51 An: BaseX basex-talk@mailman.uni-konstanz.de Betreff: [basex-talk] Add namespace bindings via copy/modify/return Dear BaseX people, I cannot use copy/modify/return in order to add a namespacing: let $doc := <doc><a/></doc>return    copy $doc_ := $doc    modify      insert node namespace xyz {'https://basex.org/ns%27%7D into $doc_    return $doc_ =><doc>  <a/></doc> Is this a bug? Kind regards,Hans-Jürgen

Thank you very much, Christian, a tip much appreciated! It works. In case (quite improbable) that someone else faces the requirement to add namespaces, retaining the base URI, I add the code of a function I wrote for this operation. Kind regards,Hans-Jürgen PS: Is it not simply oversight that the Update spec does not support the insertion of namespace nodes, although XQuery 3.0 does define their constructors? Would a feature request have any chance?  (:~  : Adds namespace nodes to a node, retaining its base URI.  : Note that the namespaces are added to the root element of  : the incoming document or fragment.  :) declare function f:addNamespaces($node as node(),                                                                    $namespaces as namespace-node()*)         as node() {    let $root := $node ! root()    let $fnElem := function($n) {$n/descendant-or-self::*[1]}    let $prefixes := $namespaces ! name(.)    let $uris := $namespaces ! string(.)    return $root        update {            for $p at $pos in $prefixes            let $uri := $uris[$pos]            let $attName := QName($uri, $p||':_')            return insert node attribute {$attName} {()} into $fnElem(.)        }        update {            let $elem := $fnElem(.)            for $p in $prefixes             return delete node $elem/@*[name() eq $p||':_']        }};

Am Montag, 4. August 2025 um 17:03:28 MESZ hat Christian Grün cg@basex.org Folgendes geschrieben:

#yiv3648432543 P {margin-top:0;margin-bottom:0;}Hi Hans-Jürgen, It feels a bit clumsy, but adding a prefixed attribute and removing it again should do the job:   let $xml := doc('x.xml')  let $updated := $xml update {    insert node <a xmlns:prefix='URI' prefix:attr=''/>/@* into *  } update {    delete node */@attr  }  return ($updated, base-uri($updated)) Best,Christian Von: Hans-Juergen Rennau <hrennau@yahoo.de> Gesendet: Montag, 4. August 2025 13:09 An: BaseX <basex-talk@mailman.uni-konstanz.de>; Christian Grün <cg@basex.org> Betreff: Re: AW: [basex-talk] Add namespace bindings via copy/modify/return Thank you, Christian! The problem is that this way I lose the base URI! The only way how to retain it which I am aware of would be the insertion of @xml:base, but this amounts to a change of the document I may not be authorized to do by the context.  Is there any way how to change a document (as modified copy, not via copy/modify/return) and retain or control the base URI of the result, without inserting @xml:base? Kind regards,Hans-Jürgen Am Montag, 4. August 2025 um 12:49:50 MESZ hat Christian Grün <cg@basex.org> Folgendes geschrieben:

Hi Hans-Jürgen, The insertion of namespace nodes has not been defined in the XQuery Update spec. You may need choose the classic element constructor for that: let $doc := <doc><a/></doc>return element { node-name($doc) } {  $doc/@*,  namespace xyz { 'https://basex.org/ns' },  $doc/node()} Hope this helps,ChristianVon: Hans-Juergen Rennau via BaseX-Talk <basex-talk@mailman.uni-konstanz.de> Gesendet: Samstag, 2. August 2025 15:51 An: BaseX <basex-talk@mailman.uni-konstanz.de> Betreff: [basex-talk] Add namespace bindings via copy/modify/return Dear BaseX people, I cannot use copy/modify/return in order to add a namespacing: let $doc := <doc><a/></doc>return    copy $doc_ := $doc    modify      insert node namespace xyz {'https://basex.org/ns'} into $doc_    return $doc_ =><doc>  <a/></doc> Is this a bug? Kind regards,Hans-Jürgen