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<h4>Which ORM specification ?<a id="Which_ORM_specification_"></a></h4>
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<div class="sect1">
<h2 id="index">Which ORM specification ?<a id="Which_ORM_specification_"></a></h2>
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<p>There are 2 prevalent specification in the Java ORM world. JDO provides
the most complete definition, whilst JPA is the most recent.</p>
</div>
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<h3 id="_relationships_a_id_relationships_a">Relationships<a id="Relationships"></a></h3>
<div class="paragraph">
<p>In this guide we show the different types of ORM relation commonly used,
and mark against it which specification supports it. This list is not
yet complete but will be added to to provide a comprehensive list of
relationship type and where you can find it.</p>
</div>
<table class="tableblock frame-all grid-cols spread">
<colgroup>
<col style="width: 25%;">
<col style="width: 25%;">
<col style="width: 25%;">
<col style="width: 25%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Field Type</th>
<th class="tableblock halign-left valign-top">Relation</th>
<th class="tableblock halign-left valign-top">JDO</th>
<th class="tableblock halign-left valign-top">JPA</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_one.html#uni">1-1 Unidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_one.html#bi">1-1 Bidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#PC">1-1 serialised</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/compound_identity.html#1_1_uni">1-1 CompoundIdentity Unidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/compound_identity.html#1_N_coll_bi">1-N CompoundIdentity Collection Bidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/compound_identity.html#1_N_map_bi">1-N CompoundIdentity Map Bidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Interface</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/interfaces.html">1-1 Unidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Interface</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/interfaces.html">1-1 Bidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Interface</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#Reference">1-1serialised</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">?</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#fk_uni">1-N ForeignKey Unidirectional Collection</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#fk_bi">1-N ForeignKey Bidirectional Collection</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#join_uni">1-N JoinTable Unidirectional Collection</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#join_bi">1-N JoinTable Bidirectional Collection</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;Non-PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#join_nonpc">1-N JoinTable Collection</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#shared_join">1-N JoinTable Collection using shared JoinTable</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_collection.html#shared_fk">1-N ForeignKey Collection using shared ForeignKey</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/many_to_many.html">M-N JoinTable</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/compound_identity.html#1_N_uni">1-N CompoundIdentity Unidirectional</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#Collection">1-N serialised Collection</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Collection&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#CollectionElements">1-N JoinTable Collection of serialised elements</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_list.html#fk_uni">1-N ForeignKey Unidirectional Indexed List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_list.html#fk_bi">1-N ForeignKey Bidirectional Indexed List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_list.html#join_uni">1-N JoinTable Unidirectional Indexed List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_list.html#join_bi">1-N JoinTable Bidirectional Indexed List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;Non-PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_list.html#join_nonpc">1-N JoinTable Indexed List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jpa/orm/one_to_many_list.html#fk_uni">1-N ForeignKey Unidirectional Ordered List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jpa/orm/one_to_many_list.html#fk_bi">1-N ForeignKey Bidirectional Ordered List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jpa/orm/one_to_many_list.html#join_uni">1-N JoinTable Unidirectional Ordered List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">List&lt;PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jpa/orm/one_to_many_list.html#join_bi">1-N JoinTable Bidirectional Ordered List</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;PC, PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#join_pc_pc">1-N JoinTable Map</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;Non-PC, PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#join_simple_pc">1-N JoinTable Map</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;PC, Non-PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#join_pc_simple">1-N JoinTable Map</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;Non-PC, Non-PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#join_simple_simple">1-N JoinTable Map</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;Non-PC, PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#fk_uni_key">1-N ForeignKey Map Unidirectional (key stored in value)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;Non-PC, PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#fk_bi_key">1-N ForeignKey Map Bidirectional (key stored in value)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;PC, Non-PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/one_to_many_map.html#fk_uni_value">1-N ForeignKey Map Unidirectional (value stored in key)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;PC, PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#Map">1-N serialised Map</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Map&lt;PC, PC&gt;</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#MapKeysValues">1-N JoinTable Map of serialised keys/values</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC[ ]</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/arrays.html#fk">1-N ForeignKey Unidirectional Array</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC[ ]</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/arrays.html#join">1-N JoinTable Unidirectional Array</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PC[ ]</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/serialised.html#Array">1-N serialised Array</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Non-PC[ ]</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="http://www.datanucleus.org/products/accessplatform/jdo/orm/arrays.html#join">1-N JoinTable Unidirectional Array</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-check"></i></span></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><span class="icon"><i class="fa fa-times"></i></span></p></td>
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