replace multiple occurrences of a node in XML

Hi

I'm trying to delete and replace the value of various nodes within XML, where the nodes I'm changing can occur more than once in my document

DECLARE
  v_xml      xmltype;
  w_xml      xmltype;
 
BEGIN
    --Generate simple XML document to pretend we received it by some interface
    v_xml := xmltype.createxml('
    <Response>
        <Card>
              <Address attr_cust="1">
                <Line1>abc</Line1>
                <Line2>def</Line2>
                <Line3>ghi</Line3>
                <Line4>jkl</Line4>
                <Line5>mno</Line5>
                <PostCode>123</PostCode>
                <Country/>
              </Address>
              <Email>aaa.bbb@ccc.ddd</Email>
        </Card>
        <Card>
              <Address attr_cust="1">
                <Line1>abc</Line1>
                <Line2>def</Line2>
                <Line3>ghi</Line3>
                <Line4>jkl</Line4>
                <Line5>mno</Line5>
                <PostCode>123</PostCode>
                <Country/>
              </Address>
              <Email>aaa.bbb@ccc.ddd</Email>
        </Card>
    </Response>
    ');

    select
      XMLQuery('copy $tmp := . modify
                (delete nodes
                    ($tmp//Line1
                    ,$tmp//PostCode
                    ,$tmp//Email
                    ),
                replace value of node $tmp//Line3 with "x",
                replace value of node $tmp//@attr_cust with "0"
                ) return $tmp'
               PASSING v_xml RETURNING CONTENT)
        INTO w_xml
        FROM (SELECT v_xml FROM dual);

    dbms_output.put_line( w_xml.extract('/*').getClobVal() );
END;

it almost works ok, except that it errors for example if node Line3 or attribute attr_cust occur more than once in my XML document

[1]: XVM-01136: [XUTY0008] Invalid target expression for 'replace'

is there a way round this?

Thanks