Saxon

Due to shortcomings of the SaxonC Python API to capture serialized result documents I started playing with using XPath and fn:transform instead to run XSLT 3, on experimenting with that I have found an interesting case where SaxonCS 12 runs the code fine while SaxonJ 12 crashes out with a NullPointerException.

So the code calls fn:transform and allows you to set the base-output-uri, I experimented with a non hierarchic one like urn:to-string and SaxonCS swallows that fine while SaxonJ crashes.

Here is the (XQuery) code:

declare namespace map = "http://www.w3.org/2005/xpath-functions/map";
declare namespace array = "http://www.w3.org/2005/xpath-functions/array";

declare namespace output = "http://www.w3.org/2010/xslt-xquery-serialization";

declare option output:method 'json';
declare option output:indent 'yes';

declare variable $base-output-uri as xs:string? external := ();


let $stylesheet-text := ``[<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="3.0" expand-text="yes">
    <xsl:output method="xml" indent="yes"/>
    <xsl:template name="xsl:initial-template">
      <main-template>
          <xsl:for-each select="1 to 3">
            <creating-xml-result>{.}</creating-xml-result>
            <xsl:result-document href="result-{.}.xml" method="xml" indent="yes">
                <xsl:document>
                  <root>
                    <xsl:for-each select="1 to .">
                      <item>{.}</item>
                    </xsl:for-each>
                  </root>
                </xsl:document>
            </xsl:result-document>
            <creating-json-result>{.}</creating-json-result>
            <xsl:result-document href="result-{.}.json" method="json" indent="yes">
                <xsl:sequence
                  select="map { 'name' : 'result ' || ., 'data' : array { 1 to . } }"/>
            </xsl:result-document>
            <xsl:result-document href="result-adaptive{.}.txt" method="adaptive" indent="yes">
                <xsl:sequence
                  select="map { 'name' : 'result ' || ., 'data' : 1 to .  }"/>
            </xsl:result-document>
          </xsl:for-each>
        </main-template>
    </xsl:template>
</xsl:stylesheet>]``
return 
if (empty($base-output-uri))
then
  transform(map{ "stylesheet-text": $stylesheet-text, "delivery-format": "serialized" })
else
  transform(map{ "stylesheet-text": $stylesheet-text, "delivery-format": "serialized", "base-output-uri": trace($base-output-uri) })

Stack trace with Saxon Java 12 HE:

PS C:\Users\marti\OneDrive\Documents\xslt\blog-xslt-3-by-example\fn-transform-output-methods> java -cp 'C:\Program Files\Saxonica\SaxonHE12-0J\saxon-he-12.0.jar' net.sf.saxon.Query .\initial-template-test0.xq base-output-uri=urn:to-string
* [1]: xs:string: urn:to-string
java.lang.NullPointerException
        at net.sf.saxon.functions.TransformFn$SerializedDeliverer.resolve(TransformFn.java:1216)
        at net.sf.saxon.expr.instruct.ResultDocument.makeReceiver(ResultDocument.java:530)
        at net.sf.saxon.expr.instruct.ResultDocument.processLeft(ResultDocument.java:480)
        at net.sf.saxon.expr.instruct.ResultDocument.processInstruction(ResultDocument.java:401)
        at net.sf.saxon.Configuration.processResultDocument(Configuration.java:2336)
        at net.sf.saxon.expr.instruct.ResultDocument$ResultDocumentElaborator.lambda$elaborateForPush$0(ResultDocument.java:977)
        at net.sf.saxon.expr.instruct.Block$BlockElaborator.lambda$elaborateForPush$4(Block.java:898)
        at net.sf.saxon.expr.instruct.ForEach$ForEachElaborator.lambda$elaborateForPush$4(ForEach.java:706)
        at net.sf.saxon.expr.instruct.FixedElement$FixedElementElaborator.lambda$elaborateForPush$0(FixedElement.java:653)
        at net.sf.saxon.expr.instruct.NamedTemplate.expand(NamedTemplate.java:274)
        at net.sf.saxon.trans.XsltController.callTemplate(XsltController.java:872)
        at net.sf.saxon.s9api.Xslt30Transformer.callTemplate(Xslt30Transformer.java:486)
        at net.sf.saxon.functions.TransformFn.call(TransformFn.java:811)
        at net.sf.saxon.expr.SystemFunctionCall$SystemFunctionCallElaborator.lambda$elaborateForPull$1(SystemFunctionCall.java:608)
        at net.sf.saxon.expr.elab.PullElaborator.lambda$elaborateForPush$0(PullElaborator.java:38)
        at net.sf.saxon.expr.instruct.Choose$ChooseExprElaborator.lambda$elaborateForPush$11(Choose.java:1176)
        at net.sf.saxon.query.XQueryExpression.processQuery(XQueryExpression.java:499)
        at net.sf.saxon.query.XQueryExpression.run(XQueryExpression.java:473)
        at net.sf.saxon.s9api.XQueryEvaluator.run(XQueryEvaluator.java:464)
        at net.sf.saxon.Query.runQuery(Query.java:975)
        at net.sf.saxon.Query.doQuery(Query.java:444)
        at net.sf.saxon.Query.main(Query.java:106)
Error in xsl:result-document/@href on line 7 column 82
   Exception thrown by output resolver
java.lang.NullPointerException
        at net.sf.saxon.functions.TransformFn$SerializedDeliverer.resolve(TransformFn.java:1216)
        at net.sf.saxon.expr.instruct.ResultDocument.makeReceiver(ResultDocument.java:530)
        at net.sf.saxon.expr.instruct.ResultDocument.processLeft(ResultDocument.java:480)
        at net.sf.saxon.expr.instruct.ResultDocument.processInstruction(ResultDocument.java:401)
        at net.sf.saxon.Configuration.processResultDocument(Configuration.java:2336)
        at net.sf.saxon.expr.instruct.ResultDocument$ResultDocumentElaborator.lambda$elaborateForPush$0(ResultDocument.java:977)
        at net.sf.saxon.expr.instruct.Block$BlockElaborator.lambda$elaborateForPush$4(Block.java:898)
        at net.sf.saxon.expr.instruct.ForEach$ForEachElaborator.lambda$elaborateForPush$4(ForEach.java:706)
        at net.sf.saxon.expr.instruct.FixedElement$FixedElementElaborator.lambda$elaborateForPush$0(FixedElement.java:653)
        at net.sf.saxon.expr.instruct.NamedTemplate.expand(NamedTemplate.java:274)
        at net.sf.saxon.trans.XsltController.callTemplate(XsltController.java:872)
        at net.sf.saxon.s9api.Xslt30Transformer.callTemplate(Xslt30Transformer.java:486)
        at net.sf.saxon.functions.TransformFn.call(TransformFn.java:811)
        at net.sf.saxon.expr.SystemFunctionCall$SystemFunctionCallElaborator.lambda$elaborateForPull$1(SystemFunctionCall.java:608)
        at net.sf.saxon.expr.elab.PullElaborator.lambda$elaborateForPush$0(PullElaborator.java:38)
        at net.sf.saxon.expr.instruct.Choose$ChooseExprElaborator.lambda$elaborateForPush$11(Choose.java:1176)
        at net.sf.saxon.query.XQueryExpression.processQuery(XQueryExpression.java:499)
        at net.sf.saxon.query.XQueryExpression.run(XQueryExpression.java:473)
        at net.sf.saxon.s9api.XQueryEvaluator.run(XQueryEvaluator.java:464)
        at net.sf.saxon.Query.runQuery(Query.java:975)
        at net.sf.saxon.Query.doQuery(Query.java:444)
        at net.sf.saxon.Query.main(Query.java:106)

at template xsl:initial-template on line 3 column 47
nullQuery failed with dynamic error: Exception thrown by output resolver

Not being able to resolve the relative xsl:result-document hrefs against the base-output-uri urn:to-string might be the right thing but I guess you don't want to crash with a NullPointerException.

But as I said, SaxonCS does manage to run the code:

PS C:\Users\marti\OneDrive\Documents\xslt\blog-xslt-3-by-example\fn-transform-output-methods> & 'C:\Program Files\Saxonica\SaxonCS-12.0\SaxonCS.exe' query .\initial-template-test0.xq base-output-uri=urn:to-string
...
* [1]: xs:string: urn:to-string
{
  "urn:result-1.xml": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<root>\n   <item>1<\/item>\n<\/root>\n",
  "urn:result-2.xml": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<root>\n   <item>1<\/item>\n   <item>2<\/item>\n<\/root>\n",
  "urn:result-3.xml": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<root>\n   <item>1<\/item>\n   <item>2<\/item>\n   <item>3<\/item>\n<\/root>\n",
  "urn:to-string": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<main-template>\n   <creating-xml-result>1<\/creating-xml-result>\n   <creating-json-result>1<\/creating-json-result>\n   <creating-xml-result>2<\/creating-xml-result>\n   <creating-json-result>2<\/creating-json-result>\n   <creating-xml-result>3<\/creating-xml-result>\n   <creating-json-result>3<\/creating-json-result>\n<\/main-template>\n",
  "urn:result-1.json": "{\n  \"data\": [ 1 ],\n  \"name\": \"result 1\"\n}",
  "urn:result-2.json": "{\n  \"data\": [ 1, 2 ],\n  \"name\": \"result 2\"\n}",
  "urn:result-3.json": "{\n  \"data\": [ 1, 2, 3 ],\n  \"name\": \"result 3\"\n}",
  "urn:result-adaptive1.txt": "map{\"data\":1,\"name\":\"result 1\"}",
  "urn:result-adaptive2.txt": "map{\"data\":(1,2),\"name\":\"result 2\"}",
  "urn:result-adaptive3.txt": "map{\"data\":(1,2,3),\"name\":\"result 3\"}"
}