======================
Features added
--------------
* Initial support for building in PyPy (through cpyext).
* DTD objects gained an API that allows read access to their
declarations.
* ``xpathgrep.py`` gained support for parsing line-by-line (e.g.
from grep output) and for surrounding the output with a new root
tag.
* ``E-factory`` in ``lxml.builder`` accepts subtypes of known data
types (such as string subtypes) when building elements around them.
* Tree iteration and ``iterparse()`` with a selective ``tag``
argument supports passing a set of tags. Tree nodes will be
returned by the iterators if they match any of the tags.
Bugs fixed
----------
* The ``.find*()`` methods in ``lxml.objectify`` no longer use XPath
internally, which makes them faster in many cases (especially when
short circuiting after a single or couple of elements) and fixes
some behavioural differences compared to ``lxml.etree``. Note that
this means that they no longer support arbitrary XPath expressions
but only the subset that the ``ElementPath`` language supports.
The previous implementation was also redundant with the normal
XPath support, which can be used as a replacement.
* ``el.find('*')`` could accidentally return a comment or processing
instruction that happened to be in the wrong spot. (Same for the
other ``.find*()`` methods.)
* The error logging is less intrusive and avoids a global setup where
possible.
* Fixed undefined names in html5lib parser.
* ``xpathgrep.py`` did not work in Python 3.
* ``Element.attrib.update()`` did not accept an ``attrib`` of
another Element as parameter.
* For subtypes of ``ElementBase`` that make the ``.text`` or ``.tail``
properties immutable (as in objectify, for example), inserting text
when creating Elements through the E-Factory feature of the class
constructor would fail with an exception, stating that the text
cannot be modified.
Other changes
--------------
* The code base was overhauled to properly use 'const' where the API
of libxml2 and libxslt requests it. This also has an impact on the
public C-API of lxml itself, as defined in ``etreepublic.pxd``, as
well as the provided declarations in the ``lxml/includes/`` directory.
Code that uses these declarations may have to be adapted. On the
plus side, this fixes several C compiler warnings, also for user
code, thus making it easier to spot real problems again.
* The functionality of "lxml.cssselect" was moved into a separate PyPI
package called "cssselect". To continue using it, you must install
that package separately. The "lxml.cssselect" module is still
available and provides the same interface, provided the "cssselect"
package can be imported at runtime.
* Element attributes passed in as an ``attrib`` dict or as keyword
arguments are now sorted by (namespaced) name before being created
to make their order predictable for serialisation and iteration.
Note that adding or deleting attributes afterwards does not take
that order into account, i.e. setting a new attribute appends it
after the existing ones.
* Several classes that are for internal use only were removed
from the ``lxml.etree`` module dict:
``_InputDocument, _ResolverRegistry, _ResolverContext, _BaseContext,
_ExsltRegExp, _IterparseContext, _TempStore, _ExceptionContext,
__ContentOnlyElement, _AttribIterator, _NamespaceRegistry,
_ClassNamespaceRegistry, _FunctionNamespaceRegistry,
_XPathFunctionNamespaceRegistry, _ParserDictionaryContext,
_FileReaderContext, _ParserContext, _PythonSaxParserTarget,
_TargetParserContext, _ReadOnlyProxy, _ReadOnlyPIProxy,
_ReadOnlyEntityProxy, _ReadOnlyElementProxy, _OpaqueNodeWrapper,
_OpaqueDocumentWrapper, _ModifyContentOnlyProxy,
_ModifyContentOnlyPIProxy, _ModifyContentOnlyEntityProxy,
_AppendOnlyElementProxy, _SaxParserContext, _FilelikeWriter,
_ParserSchemaValidationContext, _XPathContext,
_XSLTResolverContext, _XSLTContext, _XSLTQuotedStringParam``
* Several internal classes can no longer be inherited from:
``_InputDocument, _ResolverRegistry, _ExsltRegExp, _ElementUnicodeResult,
_IterparseContext, _TempStore, _AttribIterator, _ClassNamespaceRegistry,
_XPathFunctionNamespaceRegistry, _ParserDictionaryContext,
_FileReaderContext, _PythonSaxParserTarget, _TargetParserContext,
_ReadOnlyPIProxy, _ReadOnlyEntityProxy, _OpaqueDocumentWrapper,
_ModifyContentOnlyPIProxy, _ModifyContentOnlyEntityProxy,
_AppendOnlyElementProxy, _FilelikeWriter, _ParserSchemaValidationContext,
_XPathContext, _XSLTResolverContext, _XSLTContext, _XSLTQuotedStringParam,
_XSLTResultTree, _XSLTProcessingInstruction``