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CHANGES.txt
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CHANGES.txt
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==============
lxml changelog
==============
5.3.0 (2024-??-??)
==================
Bugs fixed
----------
* LP#2060160: Attribute values serialised differently in ``xmlfile.element()`` and ``xmlfile.write()``.
Other changes
-------------
* LP#2059794: The ``tests`` packages were moved out of the ``lxml`` package into a separate directory.
5.2.2 (2024-??-??)
==================
Bugs fixed
----------
* GH#417: The ``test_feed_parser`` test could fail if ``lxml_html_clean`` was not installed.
It is now skipped in that case.
* LP#2059910: The minimum CPU architecture for the Linux x86 binary wheels was set back to
"core2", without SSE 4.2.
* If libxml2 uses iconv, the compile time version is available as `etree.ICONV_COMPILED_VERSION`.
5.2.1 (2024-04-02)
==================
Bugs fixed
----------
* LP#2059910: The minimum CPU architecture for the Linux x86 binary wheels was set back to
"core2", but with SSE 4.2 enabled.
* LP#2059977: ``Element.iterfind("//absolute_path")`` failed with a ``SyntaxError``
where it should have issued a warning.
* GH#416: The documentation build was using the non-standard ``which`` command.
Patch by Michał Górny.
5.2.0 (2024-03-30)
==================
Other changes
-------------
* LP#1958539: The ``lxml.html.clean`` implementation suffered from several (only if used)
security issues in the past and was now extracted into a separate library:
https://github.com/fedora-python/lxml_html_clean
Projects that use lxml without "lxml.html.clean" will not notice any difference,
except that they won't have potentially vulnerable code installed.
The module is available as an "extra" setuptools dependency "lxml[html_clean]",
so that Projects that need "lxml.html.clean" will need to switch their requirements
from "lxml" to "lxml[html_clean]", or install the new library themselves.
* The minimum CPU architecture for the Linux x86 binary wheels was upgraded to
"sandybridge" (launched 2011), and glibc 2.28 / gcc 12 (manylinux_2_28) wheels were added.
* Built with Cython 3.0.10.
5.1.2 (2024-??-??)
==================
Bugs fixed
----------
* LP#2059977: ``Element.iterfind("//absolute_path")`` failed with a ``SyntaxError``
where it should have issued a warning.
5.1.1 (2024-03-28)
==================
Bugs fixed
----------
* LP#2048920: ``iterlinks()`` in ``lxml.html`` rejected ``bytes`` input in 5.1.0.
* High source line numbers from the parser are no longer truncated
(up to a C ``long``) when using libxml2 2.11 or later.
Other changes
-------------
* GH#407: A compatibility test was adapted to recent expat versions.
Patch by Miro Hrončok.
* Binary wheels use the library versions libxml2 2.12.6 and libxslt 1.1.39.
* Windows binary wheels use the library versions libxml2 2.11.7 and libxslt 1.1.39.
* Built with Cython 3.0.9.
5.1.0 (2024-01-05)
==================
Features added
--------------
* Parsing ASCII strings is slightly faster.
Bugs fixed
----------
* GH#349: The HTML ``Cleaner()`` interpreted an accidentally provided string parameter
for the ``host_whitelist`` as list of characters and silently failed to reject any hosts.
Passing a non-collection is now rejected.
Other changes
-------------
* Support for Python 2.7 and Python versions < 3.6 was removed.
* The wheel build was migrated to use ``cibuildwheel``.
Patch by Primož Godec.
5.0.2 (2024-03-28)
==================
Other changes
-------------
* GH#407: A compatibility test was adapted to recent expat versions.
Patch by Miro Hrončok.
* Binary wheels use the library versions libxml2 2.12.6 and libxslt 1.1.39.
* Built with Cython 3.0.9.
5.0.1 (2024-01-05)
==================
Bugs fixed
----------
* LP#2046208: Parsing non-BMP Python Unicode strings could fail on macOS.
* LP#2044225: When incrementally parsing broken HTML, reporting start events on
missing structural tags failed and could lead to subsequent exceptions.
* LP#2045435: Some (not all) issues with stricter C compilers were resolved.
* The binary wheels in the 5.0.0 release did not validate cleanly (but installed ok).
.. _latest_release:
5.0.0 (2023-12-29)
==================
Features added
--------------
* Character escaping in ``C14N2`` serialisation now uses a single pass over the text
instead of searching for each unescaped character separately.
* Early support for Python 3.13a2 was added.
Bugs fixed
----------
* LP#1976304: The ``Element.addnext()`` method previously inserted the new element
before existing tail text. The tail text of both sibling elements now stays on
the respective elements.
* LP#1980767, GH#379: ``TreeBuilder.close()`` could fail with a ``TypeError`` after
parsing incorrect input. Original patch by Enrico Minack.
* ``Element.itertext(with_tail=False)`` returned the tail text of comments and
processing instructions, despite the explicit option.
* GH#370: A crash with recent libxml2 2.11.x versions was resolved.
Patch by Michael Schlenker.
* A compile problem with recent libxml2 2.12.x versions was resolved.
* The internal exception handling in C callbacks was improved for Cython 3.0.
* The exception declarations of ``xmlInputReadCallback``, ``xmlInputCloseCallback``,
``xmlOutputWriteCallback`` and ``xmlOutputCloseCallback`` in ``tree.pxd`` were
corrected to prevent running Python code or calling into the C-API with a live
exception set.
* GH#385: The long deprecated ``unittest.m̀akeSuite()`` function is no longer used.
Patch by Miro Hrončok.
* LP#1522052: A file-system specific test is now optional and should no longer fail
on systems that don't support it.
* GH#392: Some tests were adapted for libxml2 2.13.
Patch by Nick Wellnhofer.
* Contains all fixes from lxml 4.9.4.
Other changes
-------------
* LP#1742885: lxml no longer expands external entities (XXE) by default to prevent
the security risk of loading arbitrary files and URLs. If this feature is needed,
it can be enabled in a backwards compatible way by using a parser with the option
``resolve_entities=True``. The new default is ``resolve_entities='internal'``.
* With libxml2 2.10.4 and later (as provided by the lxml 5.0 binary wheels),
parsing HTML tags with "prefixes" no longer builds a namespace dictionary
in ``nsmap`` but considers the ``prefix:name`` string the actual tag name.
With older libxml2 versions, since 2.9.11, the prefix was removed. Before
that, the prefix was parsed as XML prefix.
lxml 5.0 does not try to hide this difference but now changes the ElementPath
implementation to let ``element.find("part1:part2")`` search for the tag
``part1:part2`` in documents parsed as HTML, instead of looking only for ``part2``.
* LP#2024343: The validation of the schema file itself is now optional in the
ISO-Schematron implementation. This was done because some lxml distributions
discard the RNG validation schema file due to licensing issues. The validation
can now always be disabled with ``Schematron(..., validate_schema=False)``.
It is enabled by default if available and disabled otherwise. The module
constant ``lxml.isoschematron.schematron_schema_valid_supported`` can be used
to detect whether schema file validation is available.
* Some redundant and long deprecated methods were removed:
``parser.setElementClassLookup()``,
``xslt_transform.apply()``,
``xpath.evaluate()``.
* Some incorrect declarations were removed from ``python.pxd``. In general, this file
should not be used by external Cython code. Use the C-API declarations provided by
Cython itself instead.
* Binary wheels use the library versions libxml2 2.12.3 and libxslt 1.1.39.
* Built with Cython 3.0.7, updated to follow recent changes in Cython 3.1-dev.
4.9.4 (2023-12-19)
==================
Bugs fixed
----------
* LP#2046398: Inserting/replacing an ancestor into a node's children could loop indefinitely.
* LP#1980767, GH#379: ``TreeBuilder.close()`` could fail with a ``TypeError`` after
parsing incorrect input. Original patch by Enrico Minack.
* LP#1522052: A file-system specific test is now optional and should no longer fail
on systems that don't support it.
Other changes
-------------
* Wheels include zlib 1.3, libxml2 2.10.3 and libxslt 1.1.39
(zlib 1.2.12, libxml2 2.10.3 and libxslt 1.1.37 on Windows).
* Built with Cython 0.29.37.
4.9.3 (2023-07-05)
==================
Bugs fixed
----------
* LP#2008911: ``lxml.objectify`` accepted non-decimal numbers like ``²²²`` as integers.
* A memory leak in ``lxml.html.clean`` was resolved by switching to Cython 0.29.34+.
* GH#348: URL checking in the HTML cleaner was improved.
Patch by Tim McCormack.
* GH#371, GH#373: Some regex strings were changed to raw strings to fix Python warnings.
Patches by Jakub Wilk and Anthony Sottile.
Other changes
-------------
* Wheels include zlib 1.2.13, libxml2 2.10.3 and libxslt 1.1.38
(zlib 1.2.12, libxml2 2.10.3 and libxslt 1.1.37 on Windows).
* Built with Cython 0.29.36 to adapt to changes in Python 3.12.
4.9.2 (2022-12-13)
==================
Bugs fixed
----------
* CVE-2022-2309: A Bug in libxml2 2.9.1[0-4] could let namespace declarations
from a failed parser run leak into later parser runs. This bug was worked around
in lxml and resolved in libxml2 2.10.0.
https://gitlab.gnome.org/GNOME/libxml2/-/issues/378
Other changes
-------------
* LP#1981760: ``Element.attrib`` now registers as ``collections.abc.MutableMapping``.
* lxml now has a static build setup for macOS on ARM64 machines (not used for building wheels).
Patch by Quentin Leffray.
4.9.1 (2022-07-01)
==================
Bugs fixed
----------
* A crash was resolved when using ``iterwalk()`` (or ``canonicalize()``)
after parsing certain incorrect input. Note that ``iterwalk()`` can crash
on *valid* input parsed with the same parser *after* failing to parse the
incorrect input.
4.9.0 (2022-06-01)
==================
Bugs fixed
----------
* GH#341: The mixin inheritance order in ``lxml.html`` was corrected.
Patch by xmo-odoo.
Other changes
-------------
* Built with Cython 0.29.30 to adapt to changes in Python 3.11 and 3.12.
* Wheels include zlib 1.2.12, libxml2 2.9.14 and libxslt 1.1.35
(libxml2 2.9.12+ and libxslt 1.1.34 on Windows).
* GH#343: Windows-AArch64 build support in Visual Studio.
Patch by Steve Dower.
4.8.0 (2022-02-17)
==================
Features added
--------------
* GH#337: Path-like objects are now supported throughout the API instead of just strings.
Patch by Henning Janssen.
* The ``ElementMaker`` now supports ``QName`` values as tags, which always override
the default namespace of the factory.
Bugs fixed
----------
* GH#338: In lxml.objectify, the XSI float annotation "nan" and "inf" were spelled in
lower case, whereas XML Schema datatypes define them as "NaN" and "INF" respectively.
Patch by Tobias Deiminger.
Other changes
-------------
* Built with Cython 0.29.28.
4.7.1 (2021-12-13)
==================
Features added
--------------
* Chunked Unicode string parsing via ``parser.feed()`` now encodes the input data
to the native UTF-8 encoding directly, instead of going through ``Py_UNICODE`` /
``wchar_t`` encoding first, which previously required duplicate recoding in most cases.
Bugs fixed
----------
* The standard namespace prefixes were mishandled during "C14N2" serialisation on Python 3.
See https://mail.python.org/archives/list/lxml@python.org/thread/6ZFBHFOVHOS5GFDOAMPCT6HM5HZPWQ4Q/
* ``lxml.objectify`` previously accepted non-XML numbers with underscores (like "1_000")
as integers or float values in Python 3.6 and later. It now adheres to the number
format of the XML spec again.
* LP#1939031: Static wheels of lxml now contain the header files of zlib and libiconv
(in addition to the already provided headers of libxml2/libxslt/libexslt).
Other changes
-------------
* Wheels include libxml2 2.9.12+ and libxslt 1.1.34 (also on Windows).
4.7.0 (2021-12-13)
==================
* Release retracted due to missing files in lxml/includes/.
4.6.5 (2021-12-12)
==================
Bugs fixed
----------
* A vulnerability (GHSL-2021-1038) in the HTML cleaner allowed sneaking script
content through SVG images (CVE-2021-43818).
* A vulnerability (GHSL-2021-1037) in the HTML cleaner allowed sneaking script
content through CSS imports and other crafted constructs (CVE-2021-43818).
4.6.4 (2021-11-01)
==================
Features added
--------------
* GH#317: A new property ``system_url`` was added to DTD entities.
Patch by Thirdegree.
* GH#314: The ``STATIC_*`` variables in ``setup.py`` can now be passed via env vars.
Patch by Isaac Jurado.
4.6.3 (2021-03-21)
==================
Bugs fixed
----------
* A vulnerability (CVE-2021-28957) was discovered in the HTML Cleaner by Kevin Chung,
which allowed JavaScript to pass through. The cleaner now removes the HTML5
``formaction`` attribute.
4.6.2 (2020-11-26)
==================
Bugs fixed
----------
* A vulnerability (CVE-2020-27783) was discovered in the HTML Cleaner by Yaniv Nizry,
which allowed JavaScript to pass through. The cleaner now removes more sneaky
"style" content.
4.6.1 (2020-10-18)
==================
Bugs fixed
----------
* A vulnerability was discovered in the HTML Cleaner by Yaniv Nizry, which allowed
JavaScript to pass through. The cleaner now removes more sneaky "style" content.
4.6.0 (2020-10-17)
==================
Features added
--------------
* GH#310: ``lxml.html.InputGetter`` supports ``__len__()`` to count the number of input fields.
Patch by Aidan Woolley.
* ``lxml.html.InputGetter`` has a new ``.items()`` method to ease processing all input fields.
* ``lxml.html.InputGetter.keys()`` now returns the field names in document order.
* GH-309: The API documentation is now generated using ``sphinx-apidoc``.
Patch by Chris Mayo.
Bugs fixed
----------
* LP#1869455: C14N 2.0 serialisation failed for unprefixed attributes
when a default namespace was defined.
* ``TreeBuilder.close()`` raised ``AssertionError`` in some error cases where it
should have raised ``XMLSyntaxError``. It now raises a combined exception to
keep up backwards compatibility, while switching to ``XMLSyntaxError`` as an
interface.
4.5.2 (2020-07-09)
==================
Bugs fixed
----------
* ``Cleaner()`` now validates that only known configuration options can be set.
* LP#1882606: ``Cleaner.clean_html()`` discarded comments and PIs regardless of the
corresponding configuration option, if ``remove_unknown_tags`` was set.
* LP#1880251: Instead of globally overwriting the document loader in libxml2, lxml now
sets it per parser run, which improves the interoperability with other users of libxml2
such as libxmlsec.
* LP#1881960: Fix build in CPython 3.10 by using Cython 0.29.21.
* The setup options "--with-xml2-config" and "--with-xslt-config" were accidentally renamed
to "--xml2-config" and "--xslt-config" in 4.5.1 and are now available again.
4.5.1 (2020-05-19)
==================
Bugs fixed
----------
* LP#1570388: Fix failures when serialising documents larger than 2GB in some cases.
* LP#1865141, GH#298: ``QName`` values were not accepted by the ``el.iter()`` method.
Patch by xmo-odoo.
* LP#1863413, GH#297: The build failed to detect libraries on Linux that are only
configured via pkg-config.
Patch by Hugh McMaster.
4.5.0 (2020-01-29)
==================
Features added
--------------
* A new function ``indent()`` was added to insert tail whitespace for pretty-printing
an XML tree.
Bugs fixed
----------
* LP#1857794: Tail text of nodes that get removed from a document using item
deletion disappeared silently instead of sticking with the node that was removed.
Other changes
-------------
* MacOS builds are 64-bit-only by default.
Set CFLAGS and LDFLAGS explicitly to override it.
* Linux/MacOS Binary wheels now use libxml2 2.9.10 and libxslt 1.1.34.
* LP#1840234: The package version number is now available as ``lxml.__version__``.
4.4.3 (2020-01-28)
==================
Bugs fixed
----------
* LP#1844674: ``itertext()`` was missing tail text of comments and PIs since 4.4.0.
4.4.2 (2019-11-25)
==================
Bugs fixed
----------
* LP#1835708: ``ElementInclude`` incorrectly rejected repeated non-recursive
includes as recursive.
Patch by Rainer Hausdorf.
4.4.1 (2019-08-11)
==================
Bugs fixed
----------
* LP#1838252: The order of an OrderedDict was lost in 4.4.0 when passing it as
attrib mapping during element creation.
* LP#1838521: The package metadata now lists the supported Python versions.
4.4.0 (2019-07-27)
==================
Features added
--------------
* ``Element.clear()`` accepts a new keyword argument ``keep_tail=True`` to clear
everything but the tail text. This is helpful in some document-style use cases
and for clearing the current element in ``iterparse()`` and pull parsing.
* When creating attributes or namespaces from a dict in Python 3.6+, lxml now
preserves the original insertion order of that dict, instead of always sorting
the items by name. A similar change was made for ElementTree in CPython 3.8.
See https://bugs.python.org/issue34160
* Integer elements in ``lxml.objectify`` implement the ``__index__()`` special method.
* GH#269: Read-only elements in XSLT were missing the ``nsmap`` property.
Original patch by Jan Pazdziora.
* ElementInclude can now restrict the maximum inclusion depth via a ``max_depth``
argument to prevent content explosion. It is limited to 6 by default.
* The ``target`` object of the XMLParser can have ``start_ns()`` and ``end_ns()``
callback methods to listen to namespace declarations.
* The ``TreeBuilder`` has new arguments ``comment_factory`` and ``pi_factory`` to
pass factories for creating comments and processing instructions, as well as
flag arguments ``insert_comments`` and ``insert_pis`` to discard them from the
tree when set to false.
* A `C14N 2.0 <https://www.w3.org/TR/xml-c14n2/>`_ implementation was added as
``etree.canonicalize()``, a corresponding ``C14NWriterTarget`` class, and
a ``c14n2`` serialisation method.
Bugs fixed
----------
* When writing to file paths that contain the URL escape character '%', the file
path could wrongly be mangled by URL unescaping and thus write to a different
file or directory. Code that writes to file paths that are provided by untrusted
sources, but that must work with previous versions of lxml, should best either
reject paths that contain '%' characters, or otherwise make sure that the path
does not contain maliciously injected '%XX' URL hex escapes for paths like '../'.
* Assigning to Element child slices with negative step could insert the slice at
the wrong position, starting too far on the left.
* Assigning to Element child slices with overly large step size could take very
long, regardless of the length of the actual slice.
* Assigning to Element child slices of the wrong size could sometimes fail to
raise a ValueError (like a list assignment would) and instead assign outside
of the original slice bounds or leave parts of it unreplaced.
* The ``comment`` and ``pi`` events in ``iterwalk()`` were never triggered, and
instead, comments and processing instructions in the tree were reported as
``start`` elements. Also, when walking an ElementTree (as opposed to its root
element), comments and PIs outside of the root element are now reported.
* LP#1827833: The RelaxNG compact syntax support was broken with recent versions
of ``rnc2rng``.
* LP#1758553: The HTML elements ``source`` and ``track`` were added to the list
of empty tags in ``lxml.html.defs``.
* Registering a prefix other than "xml" for the XML namespace is now rejected.
* Failing to write XSLT output to a file could raise a misleading exception.
It now raises ``IOError``.
Other changes
-------------
* Support for Python 3.4 was removed.
* When using ``Element.find*()`` with prefix-namespace mappings, the empty string
is now accepted to define a default namespace, in addition to the previously
supported ``None`` prefix. Empty strings are more convenient since they keep
all prefix keys in a namespace dict strings, which simplifies sorting etc.
* The ``ElementTree.write_c14n()`` method has been deprecated in favour of the
long preferred ``ElementTree.write(f, method="c14n")``. It will be removed
in a future release.
4.3.5 (2019-07-27)
==================
* Rebuilt with Cython 0.29.13 to support Python 3.8.
4.3.4 (2019-06-10)
==================
* Rebuilt with Cython 0.29.10 to support Python 3.8.
4.3.3 (2019-03-26)
==================
Bugs fixed
----------
* Fix leak of output buffer and unclosed files in ``_XSLTResultTree.write_output()``.
4.3.2 (2019-02-29)
==================
Bugs fixed
----------
* Crash in 4.3.1 when appending a child subtree with certain text nodes.
Other changes
-------------
* Built with Cython 0.29.6.
4.3.1 (2019-02-08)
==================
Bugs fixed
----------
* LP#1814522: Crash when appending a child subtree that contains unsubstituted
entity references.
Other changes
-------------
* Built with Cython 0.29.5.
4.3.0 (2019-01-04)
==================
Features added
--------------
* The module ``lxml.sax`` is compiled using Cython in order to speed it up.
* GH#267: ``lxml.sax.ElementTreeProducer`` now preserves the namespace prefixes.
If two prefixes point to the same URI, the first prefix in alphabetical order
is used. Patch by Lennart Regebro.
* Updated ISO-Schematron implementation to 2013 version (now MIT licensed)
and the corresponding schema to the 2016 version (with optional "properties").
Other changes
-------------
* GH#270, GH#271: Support for Python 2.6 and 3.3 was removed.
Patch by hugovk.
* The minimum dependency versions were raised to libxml2 2.9.2 and libxslt 1.1.27,
which were released in 2014 and 2012 respectively.
* Built with Cython 0.29.2.
4.2.6 (2019-01-02)
==================
Bugs fixed
----------
* LP#1799755: Fix a DeprecationWarning in Py3.7+.
* Import warnings in Python 3.6+ were resolved.
4.2.5 (2018-09-09)
==================
Bugs fixed
----------
* Javascript URLs that used URL escaping were not removed by the HTML cleaner.
Security problem found by Omar Eissa. (CVE-2018-19787)
4.2.4 (2018-08-03)
==================
Features added
--------------
* GH#259: Allow using ``pkg-config`` for build configuration.
Patch by Patrick Griffis.
Bugs fixed
----------
* LP#1773749, GH#268: Crash when moving an element to another document with
``Element.insert()``.
Patch by Alexander Weggerle.
4.2.3 (2018-06-27)
==================
Bugs fixed
----------
* Reverted GH#265: lxml links against zlib as a shared library again.
4.2.2 (2018-06-22)
==================
Bugs fixed
----------
* GH#266: Fix sporadic crash during GC when parse-time schema validation is used
and the parser participates in a reference cycle.
Original patch by Julien Greard.
* GH#265: lxml no longer links against zlib as a shared library, only on static builds.
Patch by Nehal J Wani.
4.2.1 (2018-03-21)
==================
Bugs fixed
----------
* LP#1755825: ``iterwalk()`` failed to return the 'start' event for the initial
element if a tag selector is used.
* LP#1756314: Failure to import 4.2.0 into PyPy due to a missing library symbol.
* LP#1727864, GH#258: Add "-isysroot" linker option on MacOS as needed by XCode 9.
4.2.0 (2018-03-13)
==================
Features added
--------------
* GH#255: ``SelectElement.value`` returns more standard-compliant and
browser-like defaults for non-multi-selects. If no option is selected, the
value of the first option is returned (instead of None). If multiple options
are selected, the value of the last one is returned (instead of that of the
first one). If no options are present (not standard-compliant)
``SelectElement.value`` still returns ``None``.
* GH#261: The ``HTMLParser()`` now supports the ``huge_tree`` option.
Patch by stranac.
Bugs fixed
----------
* LP#1551797: Some XSLT messages were not captured by the transform error log.
* LP#1737825: Crash at shutdown after an interrupted iterparse run with XMLSchema
validation.
Other changes
-------------
4.1.1 (2017-11-04)
==================
* Rebuild with Cython 0.27.3 to improve support for Py3.7.
4.1.0 (2017-10-13)
==================
Features added
--------------
* ElementPath supports text predicates for current node, like "[.='text']".
* ElementPath allows spaces in predicates.
* Custom Element classes and XPath functions can now be registered with a
decorator rather than explicit dict assignments.
* Static Linux wheels are now built with link time optimisation (LTO) enabled.
This should have a beneficial impact on the overall performance by providing
a tighter compiler integration between lxml and libxml2/libxslt.
Bugs fixed
----------
* LP#1722776: Requesting non-Element objects like comments from a document with
``PythonElementClassLookup`` could fail with a TypeError.
4.0.0 (2017-09-17)
==================
Features added
--------------
* The ElementPath implementation is now compiled using Cython,
which speeds up the ``.find*()`` methods quite significantly.
* The modules ``lxml.builder``, ``lxml.html.diff`` and ``lxml.html.clean``
are also compiled using Cython in order to speed them up.
* ``xmlfile()`` supports async coroutines using ``async with`` and ``await``.
* ``iterwalk()`` has a new method ``skip_subtree()`` that prevents walking into
the descendants of the current element.
* ``RelaxNG.from_rnc_string()`` accepts a ``base_url`` argument to
allow relative resource lookups.
* The XSLT result object has a new method ``.write_output(file)`` that serialises
output data into a file according to the ``<xsl:output>`` configuration.
Bugs fixed
----------
* GH#251: HTML comments were handled incorrectly by the soupparser.
Patch by mozbugbox.
* LP#1654544: The html5parser no longer passes the ``useChardet`` option
if the input is a Unicode string, unless explicitly requested. When parsing
files, the default is to enable it when a URL or file path is passed (because
the file is then opened in binary mode), and to disable it when reading from
a file(-like) object.
Note: This is a backwards incompatible change of the default configuration.
If your code parses byte strings/streams and depends on character detection,
please pass the option ``guess_charset=True`` explicitly, which already worked
in older lxml versions.
* LP#1703810: ``etree.fromstring()`` failed to parse UTF-32 data with BOM.
* LP#1526522: Some RelaxNG errors were not reported in the error log.
* LP#1567526: Empty and plain text input raised a TypeError in soupparser.
* LP#1710429: Uninitialised variable usage in HTML diff.
* LP#1415643: The closing tags context manager in ``xmlfile()`` could continue
to output end tags even after writing failed with an exception.
* LP#1465357: ``xmlfile.write()`` now accepts and ignores None as input argument.
* Compilation under Py3.7-pre failed due to a modified function signature.
Other changes
-------------
* The main module source files were renamed from ``lxml.*.pyx`` to plain
``*.pyx`` (e.g. ``etree.pyx``) to simplify their handling in the build
process. Care was taken to keep the old header files as fallbacks for
code that compiles against the public C-API of lxml, but it might still
be worth validating that third-party code does not notice this change.
3.8.0 (2017-06-03)
==================
Features added
--------------
* ``ElementTree.write()`` has a new option ``doctype`` that writes out a
doctype string before the serialisation, in the same way as ``tostring()``.
* GH#220: ``xmlfile`` allows switching output methods at an element level.
Patch by Burak Arslan.
* LP#1595781, GH#240: added a PyCapsule Python API and C-level API for
passing externally generated libxml2 documents into lxml.
* GH#244: error log entries have a new property ``path`` with an XPath
expression (if known, None otherwise) that points to the tree element
responsible for the error. Patch by Bob Kline.
* The namespace prefix mapping that can be used in ElementPath now injects
a default namespace when passing a None prefix.
Bugs fixed
----------
* GH#238: Character escapes were not hex-encoded in the ``xmlfile`` serialiser.
Patch by matejcik.
* GH#229: fix for externally created XML documents. Patch by Theodore Dubois.
* LP#1665241, GH#228: Form data handling in lxml.html no longer strips the
option values specified in form attributes but only the text values.
Patch by Ashish Kulkarni.
* LP#1551797: revert previous fix for XSLT error logging as it breaks
multi-threaded XSLT processing.
* LP#1673355, GH#233: ``fromstring()`` html5parser failed to parse byte strings.
Other changes
-------------
* The previously undocumented ``docstring`` option in ``ElementTree.write()``
produces a deprecation warning and will eventually be removed.
3.7.4 (2017-??-??)
==================