Possible error in XML spec

In production 82 the NotationDecl is defined as having either a ExternalID or a PublicID, however an ExternalID (production 75) can begin with 'PUBLIC' and following parts of the production do not match the production for PublicID (83). A parser can not determine the correct syntax.

A parser which is parsing a notation is going to look to see if the token matches an external id and it is going to see 'PUBLIC' and say ok it is an External ID

Am i missing something here ?, because no one else has reported this error. I find that hard to believe.

Bryan
XML-Technologies.com