I just discovered that the TEI schema had "alternate" as one of the
values for classRef/@expand. The prose in the Guidelines, the remarks
in the tagdoc, and the Stylesheets all say it should be
"alternation".
I see this as a corrigible error, and thus have fixed it. It is,
however, a schema-changing alteration, and thus should be announced
quite up-front in the release notes.
BTW, I have checked through all of the Examplars, and none were using
either value.
See issues #1903 and #1904.