Third party source components

These tables list components in Category B as described above: open source code that has been integrated at source level, without the involvement of the original author.

Unlike contributed code, this code was not written specifically for inclusion in Saxon, but was originally published under some other license.

B2 XPath parser

Origin	James Clark (www.jclark.com)
Description	Top-down parser and lexical tokenizer for XPath
Approximate LOC	1000 (including data sets)
Saxon packages / modules	`net.sf.saxon.expr.*`, modules `XPathParser`, `Tokenizer`, `Token`. Used in both the Java and C# products.
Modifications	Almost entirely rewritten over the years, with enhancements to handle XPath 2.0/3.0/3.1 and XQuery 1.0/3.0/3.1 syntax, improved error reporting, etc.
Availability of source	Derives from James Clark's xt product, which in its original form is at `http://www.jclark.com/xml/xt-old.html`. Package `com.jclark.xsl.expr`, modules `ExprParser` and `ExprTokenizer`
Source version used	Unknown. Snapshot taken in 1999.
License	James Clark (see below). Apparently copyright has since been transferred to the Thai Open Source Center Ltd.

Copyright (c) 1998, 1999 James Clark

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL JAMES CLARK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of James Clark shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from James Clark.

B3 Apache Jakarta Regexp engine

Saxon includes a regular expression engine derived from the Apache Jakarta Regexp project, which was originally developed by Jonathan Locke. It has been extensively modified to make the syntax and semantics conform to the W3C specifications, to fully support Unicode, to improve performance, and to integrate with Saxon.

Origin	Apache (author Jonathan Locke)
Description	Regular Expression engine
Approximate LOC	2600
Saxon packages / modules	Package `net.sf.saxon.regex`, classes `RECompiler`, `REProgram`, `REMatcher`. Used in both the Java and C# products.
Modifications	Substantial modifications to implement the XSD and XPath regular expression syntax and semantics, to add Unicode support, to improve performance, and to integrate with the rest of the Saxon code.
Availability of source	http://jakarta.apache.org/regexp/
Source version used	Version 1.5
License	Apache License, version 2.0

B4 Immutable hash trie

Saxon implements XPath maps using an immutable hash trie map. The implementation is derived from code published on GitHub by Michael Froh. The published GitHub code carries no licensing conditions, but the author has given permission for Saxonica to release the code under the Mozilla Public License 2.0.

Origin	Github Gist (author Michael Froh, msfroh)
Description	Implementation of immutable hash trie maps
Approximate LOC	500
Saxon packages / modules	Package `com.saxonica.functions.trie`, classes `ImmutableMap` and `ImmutableHashTrieMap`. Used in the Java product only (SaxonCS uses the class `ImmutableDictionary` from the Nuget package `System.Collections.Immutable`).
Modifications	Minor modifications to integrate with Saxon code, especially by removing dependencies on some utility classes also published by the author.
Availability of source	https://gist.github.com/msfroh
Source version used	Version dated 2012-06-02
License	Mozilla Public License, version 2.0