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## Package net.sf.saxon.tree

This package defines the implementation of the so-called "standard tree" structure.

See:
Description

Interface Summary
NodeFactory | Interface NodeFactory.

Class Summary
DocumentImpl | A node in the XML parse tree representing the Document itself (or equivalently, the root node of the Document).
ElementImpl | ElementImpl implements an element with no attributes or namespace declarations.
ElementWithAttributes | A node in the XML parse tree representing an XML element.
LineNumberMap | Line numbers are not held in nodes in the tree, because they are not usually needed.
NodeImpl | A node in the XML parse tree representing an XML element, character content, or attribute.
SystemIdMap | System IDs are not held in nodes in the tree, because they are usually the same for a whole document.
TreeBuilder | The Builder class is responsible for taking a stream of SAX events and constructing a Document tree.

## Package net.sf.saxon.tree Description

This package defines the implementation of the so-called "standard 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.

Michael H. Kay
Saxonica Limited
9 February 2005

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Copyright (C) Michael H. Kay. All rights reserved.