CoreExtension coreExtension = new CoreExtension();
        for (int i = parser.getAttributeCount() - 1; i >= 0; i--) {
            String name = parser.getAttributeName(i);
            String value = parser.getAttributeValue(i);

            if (name.indexOf(':') >= 0) {
                // just ignore attributes with non-default namespace (for example: xmlns:xsi)
            } else {

     * @param parser The XML parser
     * @return Name of the custom implementation; otherwise {@code null}
     */
    private static String parseImplementation(final XmlPullParser parser) {
        return parser.getAttributeValue(null, "implementation");
    }

    /**
     * Attempts to load the named implementation, uses default implementation if no name is given.
     *
     * @param name The optional implementation name