XML Question: What is "NDATA"?

I saw a line in an XML file:
<!ENTITY picture SYSTEM "http://www.somesite.com/somePic.gif" NDATA GIF>
What's the "NDATA". What's the use of it.And how to define it.
By the way, What's the use of NOTATION?

Refer to the section EXTERNAL (UNPARSED) GENERAL ENTITY Declaration:
http://www.xmlwriter.net/xml_guide/entity_declaration.shtml

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