*
*/
public ExtensionContext getExtensionContext(String namespace)
throws XSLException
{
ExtensionContext extension =
(ExtensionContext) extensionTable.get(namespace);
if (extension == null) {
extension = sheet.createExtensionContext(namespace);
if (extension == null) {
extension = new ExtensionContext()
{
public boolean available(String name) {
return false;
}