/**
 * Collections are Item local objects that reference other Items.
 * 
 * <p>In parallel with the OO meta-model, Items can be linked to other Items in
 * different ways. These links are modelled with Collections, which are local
 * objects stored in an Item which reference a number of other Items in the same
 * server. The Collections holds a CollectionMember, sometimes known as a slot,
 * to reference each Item and store additional information about the link.
 * 
 * <p>Features:
 * <ul>
 * <li><b>Typing<b> - Collections can restrict membership of based on type 
 * information derived from Item, Property and Collection descriptions. This
 * restriction may be per-slot or apply to the whole Collection.
 * 
 * <li><b>Fixed or flexible slots</b> - The CollectionMember objects of a
 * Collection may be empty, individually typed, or created and removed as
 * required, simulating either array, structures or lists.
 * 
 * <li><b>Layout</b> - Collections can include a {@link GraphModel} to lay out
 * its slots on a two-dimensional canvas, for modelling real world compositions.
 * </ul>
 */

package com.c2kernel.collection;