There is an ambiguity in Dick's example depending on who had the birthday, Egbert or Shakespeare.  If it was S's birthday, the non-restrictive relative clause is included in the appositive phrase.  If it was E's birthday, the non-restrictive relative clause is parallel to and separate from the appositive.  A possibly better illustration of an included clause would be the one in the following, where the clause modifies the whole phrase, not just S.:

                Egbert, a devotee of Shakespeare, which are quite numerous even today, . . .


From: Assembly for the Teaching of English Grammar [mailto:[log in to unmask]] On Behalf Of Dick Veit
Sent: Friday, April 24, 2009 12:11 PM
To: [log in to unmask]
Subject: Re: question on a relative clause

On Fri, Apr 24, 2009 at 11:41 AM, Scott Woods <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Could a non-restrictive noun phrase appositive include a non-restrictive relative clause element as a postheadword modifier?

Scott Woods


Is this what you mean?
Egbert, a devotee of Shakespeare, whose birthday was yesterday, ...

Dick Veit
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