@SuppressWarnings("unchecked")
    public static Map<String, String> getNamespaces() {
        return registry.getNamespaces();
    }
@return Returns the registered prefix/namespace-pairs as map, where the keys are the
namespaces and the values are the prefixes.
tika-xmp/src/main/java/org/apache/tika/xmp/XMPMetadata.java