supportedDatatypes.put(IntegerAttribute.identifier, new IntegerAttributeProxy());
supportedDatatypes.put(AnyURIAttribute.identifier, new AnyURIAttributeProxy());
supportedDatatypes.put(HexBinaryAttribute.identifier, new HexBinaryAttributeProxy());
supportedDatatypes.put(Base64BinaryAttribute.identifier, new Base64BinaryAttributeProxy());
supportedDatatypes.put(X500NameAttribute.identifier, new X500NameAttributeProxy());
supportedDatatypes.put(RFC822NameAttribute.identifier, new RFC822NameAttributeProxy());
supportedV1Identifiers = Collections.unmodifiableSet(supportedDatatypes.keySet());
// the 2.0 datatypes
supportedDatatypes.put(DNSNameAttribute.identifier, new DNSNameAttributeProxy());