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/**
* 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;
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