Saxon » SaxonC

I am struggling to write some Python code Iusing SaxonCHE 12.4.2) allowing me to process the result of an XPath evaluation that is an XDM array. The evaluate gives me an PyXdmValue of size 1, the head then gives me a PyXdmFunctionItem, not an array, so I try to call get_array_value() on that function item but then get an error

  File "python_saxon\saxonc.pyx", line 4607, in saxonche.PyXdmItem.get_array_value
AttributeError: 'saxonche.PyXdmArray' object has no attribute 'derivednptr'

Complete code:

from saxonche import PySaxonProcessor

xslt = '''<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="adaptive"/>
  <xsl:template match="/">
    <xsl:sequence select="array { order!items!item!@code!xs:integer(.) }"/>
  </xsl:template>
</xsl:stylesheet>'''

xml = '''<order id="1021">
    <items>
        <item code="11">
            <quantity>2</quantity>
            <price>50</price>
        </item>
        <item code="21">
            <quantity>1</quantity>
            <price>250</price>
        </item>
        <item code="13">
            <quantity>4</quantity>
            <price>100</price>
        </item>
    </items>
    <status>3</status>
</order>'''

with PySaxonProcessor() as processor:

    xpath_processor = processor.new_xpath_processor()

    xpath_processor.set_parameter('xslt', processor.make_string_value(xslt))
    xpath_processor.set_parameter('xml', processor.make_string_value(xml))

    xpath_result = xpath_processor.evaluate('''transform(
        map {
            'stylesheet-text' : $xslt,
            'source-node' : parse-xml($xml),
            'delivery-format' : 'raw'
        }
    )?output''')

    print(type(xpath_result))

    print(xpath_result.size)

    head_item = xpath_result.head

    print(type(head_item))

    array_result = head_item.get_array_value()

    result_list = [item.get_atomic_value() for item in array_result.as_list()]

    print(result_list)

Output:

Traceback (most recent call last):
  File "C:\Users\marti\PycharmProjects\Xslt1Test1\saxonc12test2.py", line 52, in <module>
    array_result = head_item.get_array_value()
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "python_saxon\saxonc.pyx", line 4607, in saxonche.PyXdmItem.get_array_value
AttributeError: 'saxonche.PyXdmArray' object has no attribute 'derivednptr'
<class 'saxonche.PyXdmValue'>
1
<class 'saxonche.PyXdmFunctionItem'>

I wonder whether I shouldn't get a PyXdmArray directly or if that is not possible how to get a PyXdmArray from the PyXdmFunctionItem.