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  <code>@<b>precondition</b>:</code>&nbsp;... </td><td> 
    A condition that must be true before an object is used.  Multiple
    <code>precondition</code> fields may be used if an object has
    multiple preconditions.</td></tr>

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  <code>@<b>postcondition</b>:</code>&nbsp;... </td><td> 
    A condition that is guaranteed to be true after an object is used.
    Multiple <code>postcondition</code> fields may be used if an
    object has multiple 