All, We have identified the need for defining how undefined fields need to work in STIX 2.0. However, the term needs to be word smithed.... Right now we have the section called Undefined Fields in STIX 2.0 . But that is probably not the best term. Please sharped your pencils and help us figure out what this should be called. Thanks, Bret Bret Jordan CISSP Director of Security Architecture and Standards Office of the CTO Blue Coat Systems PGP Fingerprint: 63B4 FC53 680A 6B7D 1447 F2C0 74F8 ACAE 7415 0050 Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg. Attachment: signature.asc Description: Message signed with OpenPGP using GPGMail