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JPMML class model

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/*
 * Copyright (c) 2015 Villu Ruusmann
 */
package org.dmg.pmml;

/**
 * 
 * A marker interface for PMML elements that specify a primary key-like attribute.
 * 
 *
 * 
 * In a collection of {@link Indexable} elements, all key values, including the null key value, must be unique.
 * 
 *
 * @see HasId
 */
public interface Indexable {

	/**
	 * @return The value of the primary key-like attribute. Could be null.
	 */
	K getKey();
}