code: public XmlWriter createXMLWriter(final String systemId) throws KNXMLException
  	{
  		final XmlResolver res = new XmlResolver();
  		final OutputStream os = res.resolveOutput(systemId);
  		return create(os, true);
  	}
docs: Creates a {@link XmlWriter} to write into the XML resource located by the specified identifier.
  
  @param systemId location identifier of the XML resource
  @return XML writer
  @throws KNXMLException if creation of the writer failed or XML resource can't be resolved