Changes

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Added Aggregation and Composition relationships.
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==== Access (relationship) ====
 
==== Access (relationship) ====
 
* Should have an end arrow from the initiating object to the accessed object.  It does not necessarily indicate the direction of the flow of data.  
 
* Should have an end arrow from the initiating object to the accessed object.  It does not necessarily indicate the direction of the flow of data.  
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==== Aggregation (relationship) ====
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* Indicates that an element groups a number of other concepts, where the other concepts can also be part of other groups.  A looser relationship than with a composition.
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* Aggregated items can also be part of more than one aggregation.
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==== Composition (relationship) ====
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* Indicates that an element groups a number of other concepts, where the other concepts are a fundamental part of the group.  E.g.:  A cat is composed of a head, body, legs, tail.
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* Composed items can only be part of one composition.
    
==== Application Data  ====
 
==== Application Data  ====