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The first thing we need of a file is to check: Does it contain IFF data
and, if so, does it contain the kind of data we're looking for?  So we
come to the notion of a "data section".

A "data section" or IFF "FORM" is one self-contained "data object" that
might be stored in a file by itself.  It is one high level data object
such as a picture or a sound effect, and generally contains a grouping of
chunks.  The IFF structure "FORM" makes it self-identifying.  It could be
a composite object like a musical score with nested musical instrument

 Group FORM 
 Composite FORMs 
 Designing New Data Sections 

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