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 * Licensed to the Apache Software Foundation (ASF) under one
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 * to you under the Apache License, Version 2.0 (the
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package org.apache.olingo.odata2.api.edm;

/**
 * @org.apache.olingo.odata2.DoNotImplement
 * A CSDL NavigationProperty element
 * 
 * EdmNavigationProperty allows navigation from one entity type to another via a relationship.
 * 
 */
public interface EdmNavigationProperty extends EdmTyped, EdmMappable, EdmAnnotatable {

  /**
   * Get the relationship of the navigation property
   * 
   * @return {@link EdmAssociation}
   * @throws EdmException
   */
  EdmAssociation getRelationship() throws EdmException;

  /**
   * Get the from role of the navigation property
   * 
   * @return from role as String
   * @throws EdmException
   */
  String getFromRole() throws EdmException;

  /**
   * Get the to role of the navigation property
   * 
   * @return to role as String
   * @throws EdmException
   */
  String getToRole() throws EdmException;
}