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|  | <h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Understanding Keys and Foreign Keys</font></h1> | 
|  | <p>EclipseLink supports shared reference keys and foreign keys through:</p> | 
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|  | <p>Single key</p> | 
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|  | <p>Composite Key</p> | 
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|  | <p>Embedded Key Class</p> | 
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