The default type for representing identities is the MAEC4.0InstanceType defined in maec_4.0.xsd.

Please note that this extension is targeted against MAEC 4.0. At the time of the STIX 1.0 release MAEC 4.0 has not been released and the extension will not validate. Once MAEC 4.0 is released the STIX team will notify the community and the extension will start to work.