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The Drools and jBPM public API which is backwards compatible between releases.

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/*
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.definition.process;

import java.util.List;
import java.util.Map;

/**
 * A Node represents an activity in the process flow chart.
 * Many different predefined nodes are supported out-of-the-box.
 */
public interface Node {

	/**
	 * The id of the node.  This is unique within its NodeContainer.
	 * @return the id of the node
	 */
    long getId();

    /**
     * The name of the node
     * @return the name of the node
     */
    String getName();

    /**
     * The incoming connections for this Node.
     * A Node could have multiple entry-points.
     * This map contains the list of incoming connections for each entry-point.
     * 
     * @return the incoming connections
     */
    Map> getIncomingConnections();

    /**
     * The outgoing connections for this Node.
     * A Node could have multiple exit-points.
     * This map contains the list of outgoing connections for each exit-point.
     * 
     * @return the outgoing connections
     */
    Map> getOutgoingConnections();

    /**
     * The incoming connections for this Node for the given entry-point.
     * 
     * @return the incoming connections for the given entry point
     */
    List getIncomingConnections(String type);

    /**
     * The outgoing connections for this Node for the given exit-point.
     * 
     * @return the outgoing connections for the given exit point
     */
    List getOutgoingConnections(String type);

    /**
     * The NodeContainer this Node lives in.
     * 
     * @return the NodeContainer
     */
    NodeContainer getNodeContainer();

	/**
	 * Meta data associated with this Node.
	 */
    Map getMetaData();

	/**
	 * Meta data associated with this Node.
	 */
    @Deprecated Object getMetaData(String name);

}