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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 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 implementation of the so-called "linked tree" structure. This
* structure can be used to represent both the source document and the stylesheet.
* It is no longer the default structure for source documents, but is always used for
* stylesheets and for schema documents, because it allows each element to be represented
* by a subclass of Element with application-specific functionality.
* The classes represent the various kinds of node on the tree. Most of them
* are not visible outside the package, with the notable exception of ElementImpl,
* which can be subclassed to contain properties for a particular kind of element.
* This capability is exploited especially in the stylesheet tree.
* As well as classes representing nodes, there are classes representing
* iterators over the various XPath axes, for example ChildEnumeration
* and PrecedingEnumeration.
* The TreeBuilder performs the work of constructing a tree, from a
* sequence of SAX-like Receiver events.
* The package also contains some helper classes such as SystemIdMap
* and LineNumberMap that are used also by the TinyTree implementation.
*/
package net.sf.saxon.tree.linked;