Converting DOM to text 2003-01-21 - By Simon Kitching
Hi Sean,
The HIERARCHY_REQUEST_ERROR commonly occurs because the DOM is told to
store two element nodes at the root level.
Well-formed XML must have only one element at the top level (one root
element node).
eg this is well-formed
<?xml version="1.0">
<foo>
<bar/>
</foo>
but this is not:
<?xml version="1.0">
<foo/>
<bar/>
I suspect your XSL mapping is outputting multiple elements at the top
level. The DOMResult object the xsl engine is trying to pass the nodes
to then raises the HIERARCHY_REQUEST_ERR. I know this from personal
experience :-)
I believe that the StreamResult class doesn't raise an error if it is
passed multiple elements at the top level, it happily generates invalid
XML output in this situation (or at least not valid as a complete xml
document, though it is a valid xml fragment).
If this is in fact the problem, and you do want your xsl to generate
multiple top-level nodes, then you can create a DOM object, a single
root element, then create the DOMResult so that it adds the XSL output
as children of the pre-created root element. This results in a valid DOM
without having to modify the stylesheet.
Regards,
Simon
> ----- Original Message -----
> From: Sean Leblanc
> To: 'xalan-j-users@(protected)'
> Sent: Monday, January 20, 2003 1:04 PM
> Subject: Converting DOM to text
>
>
> Hello,
>
>
>
> I am trying to use the samples to convert DOM I already have
> in memory to a string of text.
>
>
>
> I'm looking at the DOM2DOM sample, and trying to use it, but I
> get this error:
>
>
>
> javax.xml.transform.TransformerException:
> org.w3c.dom.DOMException: HIERARCHY_REQUEST_ERR: An attempt
> was made to insert a node where it is not permitted.
>
>
>
> Here is the code. The variable "document" is passed in.
>
>
>
> // Get ready for a transformation:
>
> DOMSource xmlDomSource = new DOMSource(document);
>
> DocumentBuilderFactory dFactory =
> DocumentBuilderFactory.newInstance();
>
> dFactory.setNamespaceAware(true);
>
> DocumentBuilder dBuilder =
> dFactory.newDocumentBuilder();
>
> TransformerFactory tFactory =
> TransformerFactory.newInstance();
>
> // Get our XSL file, transform into source:
>
> File xslFile = new File("test.xsl");
>
> System.out.println("Exists? " + xslFile.exists());
>
> Document xslDoc = dBuilder.parse(xslFile);
>
> DOMSource xslDomSource = new DOMSource(xslDoc);
>
>
>
> // Set the systemId: note this is actually a URL, not
> a local filename
>
> xslDomSource.setSystemId("");
>
>
>
> // Process the stylesheet DOMSource and generate a
> Transformer.
>
> Transformer transformer =
> tFactory.newTransformer(xslDomSource);
>
>
>
> // Create an empty DOMResult for the Result.
>
> DOMResult domResult = new DOMResult();
>
>
>
>
>
> // Perform the transformation, placing the
> output in the DOMResult.
>
> transformer.transform(xmlDomSource, domResult);
>
>
>
> //Instantiate an Xalan XML serializer and use
> it to serialize the output DOM to System.out
>
> // using a default output format.
>
> Serializer serializer =
> SerializerFactory.getSerializer
>
>
> (OutputProperties.getDefaultMethodProperties("xml"));
>
> serializer.setOutputStream(System.out);
>
>
> serializer.asDOMSerializer().serialize(domResult.getNode());
>
>
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