must externalRef point to a grammar?

Jeffrey Ricker <[email protected]>
Newsgroups gmane.text.xml.relaxng.general
Message-ID <[email protected]>
I'm sorry if I missed this in the documentation. I notice in the spec
that <include> must point to a file that has a <grammar> element as
root. Is the same true for <externalRef> or can I have that file be a
simple <element> declaration as its root?
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