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<td class="back"><a id="top"></a><a href="s2.1.c.html" rel="prev">&lt;&lt;&nbsp;&sect;2.1.(c)&nbsp;Covariant refinement</a></td>
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<td class="next"><a href="s2.1.e.html" rel="next">&sect;2.1.(e)&nbsp;Use of playedBy bindings&nbsp;&gt;&gt;</a></td>
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<div class="breadcrumb"><a class="nav" href="s2.html" rel="section">&sect;2&nbsp;Role Binding</a>&nbsp;&gt;&nbsp;<a class="nav" href="s2.1.html" rel="section">&sect;2.1&nbsp;playedBy relation</a></div>
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<h4 class="subsect">&sect;2.1.(d)&nbsp;<span class="title">No-variance</span><a class="img" href="s2.1.d.html" title="PermaLink to (d)&nbsp;No-variance"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png"
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<p>An <em>implicit</em> sub-role (according to <a href="s1.3.1.c.html"
title="&sect;1.3.1.(c)&nbsp;Overriding and implicit inheritance"
class="sect">&sect;1.3.1.(c)</a>)
may only add a <code>playedBy</code> relation but never change an existing one.<br />
Note however, that implicit inheritance may implicitly specialize an existing <code>playedBy</code>
relation (this advanced situation is illustrated in <a href="s2.7.d.html"
title="&sect;2.7.(d)&nbsp;Implicit playedBy specialization"
class="sect">&sect;2.7.(d)</a>).
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<td class="back"><a href="s2.1.c.html" rel="prev">&lt;&lt;&nbsp;&sect;2.1.(c)&nbsp;Covariant refinement</a></td>
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<td class="next"><a href="s2.1.e.html" rel="next">&sect;2.1.(e)&nbsp;Use of playedBy bindings&nbsp;&gt;&gt;</a></td>
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<div class="breadcrumb"><a class="nav" href="s2.html" rel="section">&sect;2&nbsp;Role Binding</a>&nbsp;&gt;&nbsp;<a class="nav" href="s2.1.html" rel="section">&sect;2.1&nbsp;playedBy relation</a></div>
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OT/J version 1.3 &mdash; last modified: 2011-05-12
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