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<title>The persistence.xml file</title>
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<p class="betadraftsubtitle">Beta Draft: 2013-01-03</p>
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<h1><a id="sthref28" name="sthref28"></a>The persistence.xml file</h1>
<p>The JPA specification requires the use of a <code>persistence.xml</code> file for deployment. This file defines the database and entity manager options, and may contain more than one persistence unit.</p>
<p>To enable you to easily edit this information, Dali provides the <a href="ref_persistence_xmll_editor.htm#CIACCHID">persistence.xml Editor</a>. Alternatively, you can use the Eclipse XML Editor to create and maintain this information. See <a href="task_manage_persistence.htm#CIHDAJID">"Managing the persistence.xml file"</a> for more information.</p>
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<p class="notep1">Tip:</p>
<p>To work with multiple persistence units, comment out all but one persistence unit in <code>persistence.xml</code>.</p>
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<p class="subhead2">Related tasks</p>
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<p><a href="task_manage_persistence.htm#CIHDAJID">Managing the persistence.xml file</a></p>
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<li>
<p><a href="task_create_new_project.htm#CIHHEJCJ">Creating a new JPA project</a></p>
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<p class="subhead2">Related reference</p>
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<p>Section 8.2.1 "persistence.xml file" in the <a href="http://jcp.org/en/jsr/detail?id=317">JPA Specification</a></p>
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