The Internet Assigned Numbers Authority (IANA) has approved Web3D Consortium's requests to register new MIME media types for X3D media in the XML encoding.

The primary MIME media type is model/x3d+xml. This identifier shall be used when sending XML-encoded X3D content using MIME.

The full list of approved MIME media types are:

• model/x3d+xml for the XML Encoding
• model/x3d-vrml for the ClassicVRML Encoding
• model/x3d+fastinfoset for the Compressed Binary Encodings (CBE)

Full details can be found at X3D MIME Media Types.  The full list of IANA-approved model types is maintained online.