So try this:
The String "newLayer":
----------------------------------------------------------------
<g id="101" xmlns="http://www.w3.org/2000/svg";>
<polyline points="8325 2232, 8325 2540" style="fill:none;
stroke:rgb(255,000,000);"/>
<polyline points="7925 2232, 7925 2540" style="fill:none;
stroke:rgb(255,000,000);"/>
...
</g>
The parsing
----------------------------------------------------------------
InputSource is2 = new InputSource(new StringReader(newLayer));
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document newDocument = db.parse(is2);
//document is the Document from the Jsvgcanvas
Element root = (Element)document.getDocumentElement();
//a1 is the child of the "svg" tag. It's a kind of root element
Node a1 = document.getElementById("1");
//it's the <g id="101"> element
Element rootNewDocument = (Element)newDocument.getDocumentElement();
//give me: Element:g Namespace:null
System.out.println("Element:" + rootNewDocument.getTagName() + " Namespace:" +
rootNewDocument.getNamespaceURI());
//add the new elements to the document of the jsvgcanvas
a1.appendChild(document.importNode(rootNewDocument, true));
svgCanvas.setSVGDocument((SVGDocument)document);
The document when I serialize it
----------------------------------------------------------------
<?xml version="1.0" encoding="ISO-8859-1"?>
<svg xmlns="http://www.w3.org/2000/svg";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:ev="http://www.w3.org/2001/xml-events";
contentScriptType="text/ecmascript" width="824" zoomAndPan="magnify"
contentStyleType="text/css" viewBox=" -3594 -4998 18402 9790" height="438"
preserveAspectRatio="xMaxYMax meet" version="1.1">
<g id="1" transform="matrix(1 0 0 -1 0 0)">
<g id="105">
<polyline style="fill:none; stroke:rgb(255,000,000);"
points="5078 802, 5078 30"/>
<polyline style="fill:none; stroke:rgb(255,000,000);"
points="5070 802, 4665 802"/>
<polyline style="fill:none; stroke:rgb(255,000,000);"
points="4230 802, 4635 802"/>
...
</g>
<g id="101">
<polyline style="fill:none; stroke:rgb(255,000,000);"
points="8325 2232, 8325 2540"/>
<polyline style="fill:none; stroke:rgb(255,000,000);"
points="7925 2232, 7925 2540"/>
<polyline style="fill:none; stroke:rgb(255,000,000);"
points="7525 2232, 7525 2540"/>
...
</g>
</g>
</svg>
------------------------------------------------------------------
So, with this line, smth is wrong the namespace:
Element rootNewDocument = (Element)newDocument.getDocumentElement();
//give me: Element:g Namespace:null
System.out.println("Element:" + rootNewDocument.getTagName() + " Namespace:" +
rootNewDocument.getNamespaceURI());
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