(Toni Roberts - CanCore)
In the Tech. notes listing the sub-elements, I think the sub-elements of is alternative to (i.e. identifier, catalog and entry) should not be included. They are not technically sub-elements, as is alternative to is described as a character string, with recommendation to use the Repertoire of ISO/IEC 10646-1:2000 for the vocab. (Anastasia Cheetham, ATRC)
I don't know if this addresses your concern, but when I suggested we use the LOM Identifier structure, I was guided by the published CanCore guidelines. For example, go to http://www.cancore.ca/guidelines/CanCore_Guidelines_General_2.0.pdf, and scroll down to 1-5 where Identifier is documented. Identfier's value space and data type are unspecified, but both of Identifier's sub-elements, Catalog and Entry, have value space 'ISO/IEC 10646-1:2000', and data type 'character string'. I assumed that we are writing CanCore guidelines for accessibility metadata; hence, I thought we should be consistent with its existing guidelines. Even so, there is an error in defining the value space and data type of is alternative to as ISO/IEC 10646-1:2000', and 'character string', since these are for the Identfier sub-elements, not for the is alternative to (nor alternative) containers. I suspect other elements we have been working on that use Identifier are also putting the 'ISO/IEC 10646-1:2000' value space, and 'character string' at the wrong level.
(Joseph Scheuhammer, ATRC)