Model or Library

[eluser]Phil Sturgeon[/eluser]
Models and libraries are both just Classes. You can use either for either, so it comes down to whatever you feel right doing.

The basic generalisations that I follow are:

Data handling = model.

Group of functions that share properties = library

Models can be used to get data from anywhere, getting meta data from an image is the same as a database or XML file. However if you do any processing on the images, resizing, etc then that would go in a library.