v2.14.0: Mar 27 2025

### Major changes

The HTML tokenizer now conforms fully to HTML5. Several non-standard
syntax warnings were removed. Note that HTML5 tree construction isn't
implemented yet.

Binary compatibility is restricted to versions 2.14 or newer. On ELF
systems, the soname was bumped from libxml2.so.2 to libxml2.so.16.

The serialization API will now take user-provided or default encodings
into account when serializing attribute values, matching the
serialization of text and avoiding unnecessary escaping.

The XML parser won't try to merge consecutive CDATA sections as before
to align with web standards. Each CDATA section will create exactly one
node or SAX callback.

Support for RELAX NG can now be disabled with a new configuration
option independently of XML Schemas support. It is still enabled by
default.

The "legacy" configuration option won't enable support for HTTP and
LZMA anymore. These features will be removed in the next release.

Parts of the xmllint executable were refactored, allowing the
combination of more options. OOM errors should be reported reliably now.

Several improvements were made to the build systems. Meson is fully
supported now.

Parts of the buffering code were reworked and simplified.

Overflow checks before reallocations were hardenend.

Some unprefixed symbols were renamed to avoid namespace pollution.

### New features

Input callbacks can now be set on a parser context and an improved API
to create parser input is available. The following new functions,
taking a parser input object, were added:

- xmlCtxtParseDocument
- xmlCtxtParseContent as replacement for xmlParseBalancedChunkMemory
  and xmlParseInNodeContext
- xmlCtxtParseDtd

The xmlSave API now has additional options to replace global settings.

Parser options XML_PARSE_UNZIP, XML_PARSE_NO_SYS_CATALOG and
XML_PARSE_CATALOG_PI were added.

An API function to install a custom character encoding converter is
now available. This makes it possible to use ICU for encoding conversion
even if libxml2 was compiled without ICU support, see example/icu.c.

### Deprecations

Access to many public struct members is now deprecated. Several accessor
functions were added to use instead.

More internal functions were deprecated.

### Removals

Metadata about the HTML4 content model was removed from the htmlElemDesc
struct and related functions were deprecated.

The FTP module and related functions were removed.

Support for the range and point extensions of the xpointer() scheme
was removed. The rest of the XPointer implementation isn't affected.
The xpointer() scheme now behaves like the xpath1() scheme.

Several legacy symbols and the functions in xmlunicode.h were removed.

ELF version information was removed.

The shell was moved from libxml2 to xmllint. Several related functions
are no longer available.

The libxml.m4 file containing autoconf macros was removed.

The --with-tree configuration option was removed.

The hack to detect single-threaded programs under glibc was removed.

### Planned removals

Support for HTTP and LZMA compression is planned to be removed in the
2.15 release.

The following features are considered for removal:

- Modules API (xmlmodule.h)
- Schematron support
- Support for zlib compressed file I/O
- Legacy Windows build system in win32

RELAX NG support is still in a bad state and a long-term removal
candidate.

### Thanks

Thanks to the following contributors:

- Andrew Potter
- Benjamin Gilbert
- Chun-wei Fan
- correctmost
- Daniel Cheng
- Daniel E
- Florin Haja
- Grzegorz Szymaszek
- Heiko Becker
- Himanshibansal
- Jan Alexander Steffens (heftig)
- Kjell Ahlstedt
- makise-homura
- Markus Rickert
- Mike Dalessio
- Miklos Vajna
- Rosen Penev
- Ruslan Garipov
- Ryan Carsten Schmidt
- Saleem Abdulrasool
- Sam James
- Satadru Pramanik
- Taylor R Campbell
- triallax
- Yegor Yefremov
- Zak Ridouh