private Vector findDependentNamespaces(String namespace, Map table) {
        final String ns = null2EmptyString(namespace);
        Vector namespaceList = (Vector) getFromMap(table, ns);

        if (namespaceList == null) {
            namespaceList = new Vector();
            table.put(ns, namespaceList);
        }

        return namespaceList;
    }