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.

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

B5 Apache Commons Blake3 hashing

Saxon's implementation of BLAKE3, used to support the XPath 4.0 fn:hash function, is derived from the implementation in Apache Commons.

Origin	Apache. Adapted from the ISC-licensed O(1) Cryptography library by Matt Sicker and ported from the reference public domain implementation by Jack O'Connor.
Description	BLAKE3 hashing algorithm
Approximate LOC	560
Saxon packages / modules	Package `com.saxonica.functions.qt4`, class `Blake3`. Used in both the Java and C# products.
Modifications	Very minor modifications to enable transpilation of the source code to C#.
Availability of source	https://commons.apache.org/proper/commons-codec/jacoco/org.apache.commons.codec.digest/Blake3.java.html
Source version used	Snapshot taken on 2024-10-25
License	Apache License, version 2.0

B6 JSON numeric canonicalization

Formatting of floating point numbers into the format mandated by the JSON canonicalization spec.

Origin	Cloned from https://github.com/erdtman/java-json-canonicalization. The package has full support for JSON Canonicalization (RFC8785). The only part Saxon uses is the double-to-string conversion, but this is the majority of the code. Copyright 2006-2018 WebPKI.org (http://webpki.org). Apache License.
Description	JSON Canonical number representation
Approximate LOC	2100
Saxon packages / modules	Package `net.sf.saxon.serialize.jcs`. Included in both the Java and C# products; however, the C# version is inactive.
Modifications	Very minor modifications to enable transpilation of the source code to C#. Changes listed in the net.sf.saxon.serialize.jcs package-info.java file.
Availability of source	https://github.com/erdtman/java-json-canonicalization
Source version used	Snapshot taken on 2025-12-12
License	Apache License, version 2.0