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A Java-based solution for accessing, manipulating, and outputting XML data from Java code.
Src: http://www.jdom.org/

SAXBuilder sxb = new SAXBuilder();
File f = project.getLocation().toFile();
Document document = sxb.build(f);
Element root = document.getRootElement();
//Find all elements
List<Element> extensions = root.getChildren("extension");
//Add element
Element extensionPoint = new Element("extension");
extensionPoint.getAttributes().add(new Attribute("point", "extension.point.id"));
root.addContent(extensionPoint);