I’ve just learned that there’s a proposed revision to the EduPerson specification (the basic schema for attributes about people that’s used in Shibboleth, for example) which includes ORCID author IDs. The revised specification is at
http://macedir.org/specs/internet2-mace-dir-eduperson-201602-draft-02.html
and is open for comment through February 28.
Clifford Lynch
Director, CNI