public Vector<String> lookup(String namespace) {
        Enumeration<?> enumeration = properties.propertyNames();

        Vector<String> output = new Vector<String>();
        while (enumeration.hasMoreElements()) {
            String possibleKey = (String) enumeration.nextElement();

            if(possibleKey.startsWith(namespace)) {
                output.add(possibleKey);
            }
        }

        return output;
    }