xml Node.appendChild problem

From: TED (guen_at_usa.net)
Date: 12/30/03 

Date: Tue, 30 Dec 2003 19:25:28 +0100

Hi,

  I have a really complex xml dom and I can access it only using an
already developed interface.
This interface takes an XPath string and returns me the retrieved nodes.

I need to add some children.
I wrote the following code:

Element e = mydoc.createElement("mytag");
e.appendChild(mydoc.createTextNode("my text"));
xpath_retrieved_node.appendChild(e);

it doesn't work !!!
org.apache.crimson.tree.DomEx: HIERARCHY_REQUEST_ERR

Actually xpath_retrieved_node is an instance of
org.apache.crimson.tree.XmlDocument
so the called method is this one:

public Node appendChild (Node n) throws DOMException
{
     if (n instanceof Element && getDocumentElement () != null)
            throw new DomEx (DomEx.HIERARCHY_REQUEST_ERR);
     if (n instanceof DocumentType && getDoctype () != null)
             throw new DomEx (DomEx.HIERARCHY_REQUEST_ERR);
     return super.appendChild (n);
}

My Element e is not an instance of DocumentType!!!
moreover the getDoctype method looks for a DocumentType element as a
child of node and not from the tree root.
By the way is impossible to pass the second condition.

How can I add a child to this node?
I surely missed something, but I cannot immagine what!

thanks in advance for your help
TED

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