Diff for Project/Groo between 2 and 3

+ About Groo

Groo is written in PHP 5.1 with Horde 3.1. 

The code can be found in the Horde CVS: http://cvs.horde.org/incubator/groo/

You can see Groo running here: http://wanderingbooks.org

++ HIgh-level use cases

At a minimum, Groo should allow a user to:

#- catalog her books, by typing ISBNs or scanning barcodes

#- invite friends who will have access to her books

- search, tag, comment, recommend and rate books in her collective catalog

- ask to borrow a book

- approve lending of a book

- get e-mail remembering to return a book, or to ask for a book which is overdue

- arrange the exchange of books, either setting up meetings or scheduling drops

++ Basic entities

The main entities in the Groo system are **Users**, **Books** and **Items**. Users are basically managed and stored by the Horde infrastructure.

+++ Books x Items

What we call a Book in Groo is not a physical object, but rather a certain edition of a work, such as "PHP in a Nutshell, ISBN: 0596100671". An Item is a particular physical instance or exemplar of a Book, such as my own copy of "PHP in a Nutshell".

So Groo has a public database of Books, and private collections of Items, which are the user's book collections. The collections are implemented as Horde shares.