d><code>index</code> - the index of the relational attribute</dd><dd><code>value</code> - the new structure</dd></dl>
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<h4>getRelationalFormat</h4>
<pre>public&nbsp;<a href="../../weka/core/Instances.html" title="class in weka.core">Instances</a>&nbsp;getRelationalFormat(int&nbsp;index)</pre>
<div class="block">returns the format for the specified relational attribute, can be null</div>
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