Subject: Re: [xsl] Subtle (or not?) Map Processing Bug in XQuery From: "Christian Grün christian.gruen@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 7 Jan 2022 17:21:35 -0000 |
Hi Eliot, > Ibm also wondering if therebs any general source of XQuery coding patterns for working with maps in non-trivial ways? I havenbt run across one but I havenbt looked too hard yet. You could use map:remove, either with map:keysb& let $orphanMap := map:remove($imageMap, map:keys($imageMap)[not(local:notReferenced($imageMap(.)('keyname')))] ) b&or in combination with map:for-each: let $orphanMap := map:remove($imageMap, map:for-each($imageMap, function($k, $v) { if(local:notReferenced($v('keyname'))) then () else $k }) ) XQuery 4.0 will probably include a map:filter function [1] and, possibly, additional functions for iterating over the entries of a map [2]. Hope this helps, Christian [1] https://qt4cg.org/branch/master/xpath-functions-40/Overview.html#func-map-fil ter [2] https://github.com/qt4cg/qtspecs/issues/29
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