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Re-packaged Unidata udUnits

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/*
 * Copyright (c) 1998-2018 University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
package ucar.units;

/**
 * Interface for "base" entities like base units or base quantities.
 * 
 * @author Steven R. Emmerson
 */
public interface Base {
  /**
   * Indicates if this base entity is dimensionless.
   * 
   * @return true if and only if the base entity is dimensionless
   *         (e.g. (BaseQuantity.SOLID_ANGLE).
   */
  boolean isDimensionless();

  /**
   * Returns the identifier for the base entity.
   * 
   * @return The base entity's identifier (i.e. symbol or name).
   */
  String getID();

  /**
   * Indicates if this base entity is semantically the same as another object.
   * 
   * @param object
   *        The other object.
   * @return true if and only if this base entity is semantically
   *         the same as object.
   */
  boolean equals(Object object);
}