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  /*
   * $Id: Schema.java,v 1.6 2010-11-01 04:36:13 joehw Exp $
   * %W% %E%
   */
  package mf.javax.xml.validation;
  
  /**
   * Immutable in-memory representation of grammar.
   * <p/>
   * <p/>
   * This object represents a set of constraints that can be checked/
   * enforced against an XML document.
   * <p/>
   * <p/>
   * A {@link Schema} object is thread safe and applications are
   * encouraged to share it across many parsers in many threads.
   * <p/>
   * <p/>
   * A {@link Schema} object is immutable in the sense that it shouldn't
   * change the set of constraints once it is created. In other words,
   * if an application validates the same document twice against the same
   * {@link Schema}, it must always produce the same result.
   * <p/>
   * <p/>
   * A {@link Schema} object is usually created from {@link SchemaFactory}.
   * <p/>
   * <p/>
   * Two kinds of validators can be created from a {@link Schema} object.
   * One is {@link Validator}, which provides highly-level validation
   * operations that cover typical use cases. The other is
   * {@link ValidatorHandler}, which works on top of SAX for better
   * modularity.
   * <p/>
   * <p/>
   * This specification does not refine
   * the {@link java.lang.Object#equals(java.lang.Object)} method.
   * In other words, if you parse the same schema twice, you may
   * still get <code>!schemaA.equals(schemaB)</code>.
   *
   * @author <a href="mailto:Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi</a>
   * @version $Revision: 1.6 $, $Date: 2010-11-01 04:36:13 $
   * @see <a href="http://www.w3.org/TR/xmlschema-1/">XML Schema Part 1: Structures</a>
   * @see <a href="http://www.w3.org/TR/xml11/">Extensible Markup Language (XML) 1.1</a>
   * @see <a href="http://www.w3.org/TR/REC-xml">Extensible Markup Language (XML) 1.0 (Second Edition)</a>
   * @since 1.5
   */
  public abstract class Schema {
  
      /**
       * Constructor for the derived class.
       * <p/>
       * <p/>
       * The constructor does nothing.
       */
      protected Schema() {
      }
  
      /**
       * Creates a new {@link Validator} for this {@link Schema}.
       * <p/>
       * <p>A validator enforces/checks the set of constraints this object
       * represents.</p>
       * <p/>
       * <p>Implementors should assure that the properties set on the
       * {@link SchemaFactory} that created this {@link Schema} are also
       * set on the {@link Validator} constructed.</p>
       *
       * @return Always return a non-null valid object.
       */
      public abstract Validator newValidator();
  
      /**
       * Creates a new {@link ValidatorHandler} for this {@link Schema}.
       * <p/>
       * <p>Implementors should assure that the properties set on the
       * {@link SchemaFactory} that created this {@link Schema} are also
       * set on the {@link ValidatorHandler} constructed.</p>
       *
       * @return Always return a non-null valid object.
       */
      public abstract ValidatorHandler newValidatorHandler();
  }
  