@Override
    public String getURI(int index) {
        if (index < 0 || index >= attributesList.size()) {
            return null;
        }
        return attributesList.get(index).nameSpace;
    }
<b>SAX2 Attributes</b> method (don't invoke on parser);
src/nu/validator/gnu/xml/aelfred2/SAXDriver.java