Notations
Since the data in the previous code is not in XML format, the
NDATA declaration
specifies the type of the data. Here the name jpeg is used. XML does not recognize this
as meaning an image in a format defined by the Joint Photographs
Experts Group. Rather this is the name of a notation declared
elsewhere in the DTD using a NOTATION
declaration like this:
<!NOTATION jpeg SYSTEM "image/jpeg">
Here we’ve used the MIME media type image/jpeg as the external identifier for
the notation. However, there is absolutely no standard or even a
suggestion for exactly what this identifier should be. Individual
applications must define their own requirements for the contents and
meaning of notations.
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