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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2023 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

/**
 * 
This package defines the interface to the Saxon tree structure. This
 * structure is used to represent both the source document and the stylesheet.
 * Essentially, this class represents Saxon's realization of the XPath data model.
 * 
The classes in the package are rather a miscellany. What they have in common is that
 * they describe the way the Saxon tree structure is accessed, in a way that it independent
 * of the two tree implementations (in packages net.sf.saxon.tree and
 * net.sf.saxon.tinytree).
 * 
Broadly speaking, the classes fall into four categories:
 * 

 * 
Interface classes: DocumentInfo, NodeInfo, Item, ValueRepresentation. These describe the interface
 * offered by the object model to the rest of the system, including the application.
 * 
 * 
Iterator classes: SequenceIterator, AxisIterator, ArrayIterator, EmptyIterator, SingletonIterator, and others.
 * These classes provide mechanisms for iterating over sequences. The most general, and the one which
 * applications are most likely to use, is the SequenceIterator interface itself. AxisIterator is a
 * specialization of this interface whose main difference is that it cannot throw exceptions. The other
 * classes are implementations of SequenceIterator for use in particular circumstances.
 * 
 * 
Shared implementation classes: DocumentPool, NamePool, Navigator, XMLChar.
 * These contain functionality that is shared between the various tree implementations. (However, there is
 * also some shared functionality in the net.sf.saxon.tree package). These classes are
 * not generally needed by applications, with the exception of NamePool, which complex applications may
 * need to manipulate.
 * 
Information classes: Axis, NamespaceConstant. These contain constants.
 * 
 */
package net.sf.saxon.om;