// Implementation methods
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws Exception {
if ( getVar() == null ) {
throw new MissingAttributeException( "var" );
}
if ( getUrl() == null ) {
throw new MissingAttributeException( "url" );
}
ClassLoader parent = Thread.currentThread().getContextClassLoader();
if (parent == null) {
parent = getClass().getClassLoader();