RE: JAXP's ID Transform failing to include namespace declarati
Elliotte: I tried Saxon's identity transform on your document: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"> <svg xmlns="http://www.w3.org/2000/svg"/> (actually you had a spurious ";" after "svg10.dtd") and got the following output: <svg xmlns="http://www.w3.org/2000/svg" contentStyleType="text/css" contentScriptType="text/ecmascript" preserveAspectRatio="xMidYMid meet" version="1.0" zoomAndPan="magnify"></svg> This was using the Crimson DOM as a DOMSource input, and a SAXSource output which did trivial serialization of the SAX events. It's different from your reported result in that (a) it got the namespace right, and (b) it expanded default attribute values from the DTD. These are both behaviors you would expect if the transformation preserves the XPath data model. I think the problem with the missing namespace is that your Java code to create the DOM is producing a DOM that isn't equivalent to the one created by parsing the above document. The code you gave is this: // Create the document DocumentType svgDOCTYPE = impl.createDocumentType( "svg", "-//W3C//DTD SVG 1.0//EN", "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"; ); Document doc = impl.createDocument( "http://www.w3.org/2000/svg";, "svg", svgDOCTYPE); The resulting DOM contains no namespace declaration attribute, whereas the one created by parsing the source does have such an attribute. Saxon actually supplies the missing declaration if the element name contains a ":", but doesn't do so otherwise (this was probably a misguided attempt to work both with level 1 and level 2 DOM implementations). I'll fix this. Also the DOM created programmatically doesn't contain attribute nodes corresponding to the default values of attributes defined in the DTD - another thing that is liable to confuse applications. Generally, this all exposes one of the big problems with the DOM - it is trivially easy to create DOM instances programatically that could never result from parsing a well-formed document, which all makes it rather hard work to write applications that are prepared to accept an arbitrary DOM as input. Mike Kay
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