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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
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   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
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   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
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  package jdkx.lang.model.type;
  
  
  import jdkx.lang.model.element.Element;
  import jdkx.lang.model.element.TypeParameterElement;
  import jdkx.lang.model.util.Types;
  
  
  /**
   * Represents a type variable.
   * A type variable may be explicitly declared by a
   * {@linkplain TypeParameterElement type parameter} of a
   * type, method, or constructor.
   * A type variable may also be declared implicitly, as by
   * the capture conversion of a wildcard type argument
   * (see chapter {@jls 5} of
   * <cite>The Java Language Specification</cite>).
   *
   * @author Joseph D. Darcy
   * @author Scott Seligman
   * @author Peter von der Ah&eacute;
   * @see TypeParameterElement
   * @jls 4.4 Type Variables
   * @since 1.6
   */
  public interface TypeVariable extends ReferenceType {
  
      /**
       * {@return the element corresponding to this type variable}
       */
      Element asElement();
  
      /**
       * {@return the upper bound of this type variable}
       *
       * <p> If this type variable was declared with no explicit
       * upper bounds, the result is {@code java.lang.Object}.
       * If it was declared with multiple upper bounds,
       * the result is an {@linkplain IntersectionType intersection type};
       * individual bounds can be found by examining the result's
       * {@linkplain IntersectionType#getBounds() bounds}.
       *
       * @jls 4.9 Intersection Types
       */
      TypeMirror getUpperBound();
  
      /**
       * {@return the lower bound of this type variable}  While a type
       * parameter cannot include an explicit lower bound declaration,
       * capture conversion can produce a type variable with a
       * non-trivial lower bound.  Type variables otherwise have a
       * lower bound of {@link NullType}.
       *
       * @jls 18.1.3. Bounds
       */
      TypeMirror getLowerBound();
  }
  