Saxon

I am wondering why I get an empty map from fn:transform if the principal result is empty, I would nevertheless expect the map to have a property named output with an empty string result.

I am getting different results using fn:transform, depending on whether I use 'delivery-format' : 'raw' or 'delivery-format' : 'serialized', in the latter case I am getting an empty map with no output property.

Testing using Saxon HE 12.4:

File 1:

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

declare option output:method 'adaptive';

transform(
  map {
    'delivery-format' : 'raw',
    'source-node' : document { <root>test</root> },
    'stylesheet-node' : <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="3.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="#all">

  <xsl:output method="text"/>

  <xsl:template match="/" name="xsl:initial-template">
    <xsl:for-each-group select="foo/bar" group-by="baz">
      <group count="{{count(current-group())}}"/>
    </xsl:for-each-group>
  </xsl:template>

</xsl:stylesheet>
  }
)

Output:

map{"output":()}

File 2:

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

declare option output:method 'adaptive';

transform(
  map {
    'delivery-format' : 'serialized',
    'source-node' : document { <root>test</root> },
    'stylesheet-node' : <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="3.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="#all">

  <xsl:output method="text"/>

  <xsl:template match="/" name="xsl:initial-template">
    <xsl:for-each-group select="foo/bar" group-by="baz">
      <group count="{{count(current-group())}}"/>
    </xsl:for-each-group>
  </xsl:template>

</xsl:stylesheet>
  }
)

Output:

map{}