@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if (qName == "system")
			sysib = new KSystem(attributes.getValue("name"));
		else if (qName == "body")
			plib = new KBody(attributes.getValue("name"));
		else if (qName == "mass")
			mr = true;
		else if (qName == "type")
			tr = true;
		else if ((qName == "position") || (qName == "speed"))
			vib = new MVector();
		else if (qName == "x")
			xr = true;
		else if (qName == "y")
			yr = true;
		else if (qName == "z")
			zr = true;
	}