One or more syntactically valid URI references, separated by whitespace. Because
whitespace is used to separate URIs, no whitespace is permitted inside a single URI. If a
whitespace character is required in a URI, it should be escaped with the normal mechanism,
e.g. TEI%20Consortium.
cRef
(canonical reference) specifies the destination of the pointer by supplying a canonical reference from a
scheme defined in a refsDecl element in the TEI header
the value of cRef should be constructed so
that when the algorithm for the resolution of canonical
references (described in section 16.2.5 Canonical References) is
applied to it the result is a valid URI reference to the
intended target