sitories will establish class descriptions 
that apply to many AIPs. It must be possible to determine which definition applies to which 
AIP. It may also be necessary for the definitions to say something about the semantics or 
intended use of the AIPs if this could affect long-term preservation decisions. For example, 
two repositories might both preserve only digital still images, both using multi-image TIFF 
files as their preservation format. Repository 1 consists entirely of real-world photographic 
im