if (context == null) {
// take off the name off the URL
String text = getUrl().toString();
int idx = text.lastIndexOf('/');
text = text.substring(0, idx + 1);
JellyContext parentContext = new JellyContext(getRootContext(), new URL(text));
context = new AntJellyContext(project, parentContext);
// register the Ant tag library
context.registerTagLibrary( "jelly:ant", new AntTagLibrary(project) );
}