ication of how the provider must use
 a second-level cache for the persistence unit.
 The result of this method corresponds to the <code>shared-cache-mode</code>
 element in the <code>persistence.xml</code> file.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the second-level cache mode that must be used by the
 provider for the persistence unit</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
</dl>
</li>
</ul>
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