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+
+:mod:`xmllib` --- A parser for XML documents
+============================================
+
+.. module:: xmllib
+ :synopsis: A parser for XML documents.
+.. moduleauthor:: Sjoerd Mullender <Sjoerd.Mullender@cwi.nl>
+.. sectionauthor:: Sjoerd Mullender <Sjoerd.Mullender@cwi.nl>
+
+
+.. index::
+ single: XML
+ single: Extensible Markup Language
+
+.. deprecated:: 2.0
+ Use :mod:`xml.sax` instead. The newer XML package includes full support for XML
+ 1.0.
+
+.. versionchanged:: 1.5.2
+ Added namespace support.
+
+This module defines a class :class:`XMLParser` which serves as the basis for
+parsing text files formatted in XML (Extensible Markup Language).
+
+
+.. class:: XMLParser()
+
+ The :class:`XMLParser` class must be instantiated without arguments. [#]_
+
+This class provides the following interface methods and instance variables:
+
+
+.. attribute:: XMLParser.attributes
+
+ A mapping of element names to mappings. The latter mapping maps attribute names
+ that are valid for the element to the default value of the attribute, or if
+ there is no default to ``None``. The default value is the empty dictionary.
+ This variable is meant to be overridden, not extended since the default is
+ shared by all instances of :class:`XMLParser`.
+
+
+.. attribute:: XMLParser.elements
+
+ A mapping of element names to tuples. The tuples contain a function for
+ handling the start and end tag respectively of the element, or ``None`` if the
+ method :meth:`unknown_starttag` or :meth:`unknown_endtag` is to be called. The
+ default value is the empty dictionary. This variable is meant to be overridden,
+ not extended since the default is shared by all instances of :class:`XMLParser`.
+
+
+.. attribute:: XMLParser.entitydefs
+
+ A mapping of entitynames to their values. The default value contains
+ definitions for ``'lt'``, ``'gt'``, ``'amp'``, ``'quot'``, and ``'apos'``.
+
+
+.. method:: XMLParser.reset()
+
+ Reset the instance. Loses all unprocessed data. This is called implicitly at
+ the instantiation time.
+
+
+.. method:: XMLParser.setnomoretags()
+
+ Stop processing tags. Treat all following input as literal input (CDATA).
+
+
+.. method:: XMLParser.setliteral()
+
+ Enter literal mode (CDATA mode). This mode is automatically exited when the
+ close tag matching the last unclosed open tag is encountered.
+
+
+.. method:: XMLParser.feed(data)
+
+ Feed some text to the parser. It is processed insofar as it consists of
+ complete tags; incomplete data is buffered until more data is fed or
+ :meth:`close` is called.
+
+
+.. method:: XMLParser.close()
+
+ Force processing of all buffered data as if it were followed by an end-of-file
+ mark. This method may be redefined by a derived class to define additional
+ processing at the end of the input, but the redefined version should always call
+ :meth:`close`.
+
+
+.. method:: XMLParser.translate_references(data)
+
+ Translate all entity and character references in *data* and return the
+ translated string.
+
+
+.. method:: XMLParser.getnamespace()
+
+ Return a mapping of namespace abbreviations to namespace URIs that are currently
+ in effect.
+
+
+.. method:: XMLParser.handle_xml(encoding, standalone)
+
+ This method is called when the ``<?xml ...?>`` tag is processed. The arguments
+ are the values of the encoding and standalone attributes in the tag. Both
+ encoding and standalone are optional. The values passed to :meth:`handle_xml`
+ default to ``None`` and the string ``'no'`` respectively.
+
+
+.. method:: XMLParser.handle_doctype(tag, pubid, syslit, data)
+
+ .. index::
+ single: DOCTYPE declaration
+ single: Formal Public Identifier
+
+ This method is called when the ``<!DOCTYPE...>`` declaration is processed. The
+ arguments are the tag name of the root element, the Formal Public Identifier (or
+ ``None`` if not specified), the system identifier, and the uninterpreted
+ contents of the internal DTD subset as a string (or ``None`` if not present).
+
+
+.. method:: XMLParser.handle_starttag(tag, method, attributes)
+
+ This method is called to handle start tags for which a start tag handler is
+ defined in the instance variable :attr:`elements`. The *tag* argument is the
+ name of the tag, and the *method* argument is the function (method) which should
+ be used to support semantic interpretation of the start tag. The *attributes*
+ argument is a dictionary of attributes, the key being the *name* and the value
+ being the *value* of the attribute found inside the tag's ``<>`` brackets.
+ Character and entity references in the *value* have been interpreted. For
+ instance, for the start tag ``<A HREF="http://www.cwi.nl/">``, this method would
+ be called as ``handle_starttag('A', self.elements['A'][0], {'HREF':
+ 'http://www.cwi.nl/'})``. The base implementation simply calls *method* with
+ *attributes* as the only argument.
+
+
+.. method:: XMLParser.handle_endtag(tag, method)
+
+ This method is called to handle endtags for which an end tag handler is defined
+ in the instance variable :attr:`elements`. The *tag* argument is the name of
+ the tag, and the *method* argument is the function (method) which should be used
+ to support semantic interpretation of the end tag. For instance, for the endtag
+ ``</A>``, this method would be called as ``handle_endtag('A',
+ self.elements['A'][1])``. The base implementation simply calls *method*.
+
+
+.. method:: XMLParser.handle_data(data)
+
+ This method is called to process arbitrary data. It is intended to be
+ overridden by a derived class; the base class implementation does nothing.
+
+
+.. method:: XMLParser.handle_charref(ref)
+
+ This method is called to process a character reference of the form ``&#ref;``.
+ *ref* can either be a decimal number, or a hexadecimal number when preceded by
+ an ``'x'``. In the base implementation, *ref* must be a number in the range
+ 0-255. It translates the character to ASCII and calls the method
+ :meth:`handle_data` with the character as argument. If *ref* is invalid or out
+ of range, the method ``unknown_charref(ref)`` is called to handle the error. A
+ subclass must override this method to provide support for character references
+ outside of the ASCII range.
+
+
+.. method:: XMLParser.handle_comment(comment)
+
+ This method is called when a comment is encountered. The *comment* argument is
+ a string containing the text between the ``<!--`` and ``-->`` delimiters, but
+ not the delimiters themselves. For example, the comment ``<!--text-->`` will
+ cause this method to be called with the argument ``'text'``. The default method
+ does nothing.
+
+
+.. method:: XMLParser.handle_cdata(data)
+
+ This method is called when a CDATA element is encountered. The *data* argument
+ is a string containing the text between the ``<![CDATA[`` and ``]]>``
+ delimiters, but not the delimiters themselves. For example, the entity
+ ``<![CDATA[text]]>`` will cause this method to be called with the argument
+ ``'text'``. The default method does nothing, and is intended to be overridden.
+
+
+.. method:: XMLParser.handle_proc(name, data)
+
+ This method is called when a processing instruction (PI) is encountered. The
+ *name* is the PI target, and the *data* argument is a string containing the text
+ between the PI target and the closing delimiter, but not the delimiter itself.
+ For example, the instruction ``<?XML text?>`` will cause this method to be
+ called with the arguments ``'XML'`` and ``'text'``. The default method does
+ nothing. Note that if a document starts with ``<?xml ..?>``, :meth:`handle_xml`
+ is called to handle it.
+
+
+.. method:: XMLParser.handle_special(data)
+
+ .. index:: single: ENTITY declaration
+
+ This method is called when a declaration is encountered. The *data* argument is
+ a string containing the text between the ``<!`` and ``>`` delimiters, but not
+ the delimiters themselves. For example, the entity declaration ``<!ENTITY
+ text>`` will cause this method to be called with the argument ``'ENTITY text'``.
+ The default method does nothing. Note that ``<!DOCTYPE ...>`` is handled
+ separately if it is located at the start of the document.
+
+
+.. method:: XMLParser.syntax_error(message)
+
+ This method is called when a syntax error is encountered. The *message* is a
+ description of what was wrong. The default method raises a :exc:`RuntimeError`
+ exception. If this method is overridden, it is permissible for it to return.
+ This method is only called when the error can be recovered from. Unrecoverable
+ errors raise a :exc:`RuntimeError` without first calling :meth:`syntax_error`.
+
+
+.. method:: XMLParser.unknown_starttag(tag, attributes)
+
+ This method is called to process an unknown start tag. It is intended to be
+ overridden by a derived class; the base class implementation does nothing.
+
+
+.. method:: XMLParser.unknown_endtag(tag)
+
+ This method is called to process an unknown end tag. It is intended to be
+ overridden by a derived class; the base class implementation does nothing.
+
+
+.. method:: XMLParser.unknown_charref(ref)
+
+ This method is called to process unresolvable numeric character references. It
+ is intended to be overridden by a derived class; the base class implementation
+ does nothing.
+
+
+.. method:: XMLParser.unknown_entityref(ref)
+
+ This method is called to process an unknown entity reference. It is intended to
+ be overridden by a derived class; the base class implementation calls
+ :meth:`syntax_error` to signal an error.
+
+
+.. seealso::
+
+ `Extensible Markup Language (XML) 1.0 <http://www.w3.org/TR/REC-xml>`_
+ The XML specification, published by the World Wide Web Consortium (W3C), defines
+ the syntax and processor requirements for XML. References to additional
+ material on XML, including translations of the specification, are available at
+ http://www.w3.org/XML/.
+
+ `Python and XML Processing <http://www.python.org/topics/xml/>`_
+ The Python XML Topic Guide provides a great deal of information on using XML
+ from Python and links to other sources of information on XML.
+
+ `SIG for XML Processing in Python <http://www.python.org/sigs/xml-sig/>`_
+ The Python XML Special Interest Group is developing substantial support for
+ processing XML from Python.
+
+
+.. _xml-namespace:
+
+XML Namespaces
+--------------
+
+.. index:: pair: XML; namespaces
+
+This module has support for XML namespaces as defined in the XML Namespaces
+proposed recommendation.
+
+Tag and attribute names that are defined in an XML namespace are handled as if
+the name of the tag or element consisted of the namespace (the URL that defines
+the namespace) followed by a space and the name of the tag or attribute. For
+instance, the tag ``<html xmlns='http://www.w3.org/TR/REC-html40'>`` is treated
+as if the tag name was ``'http://www.w3.org/TR/REC-html40 html'``, and the tag
+``<html:a href='http://frob.com'>`` inside the above mentioned element is
+treated as if the tag name were ``'http://www.w3.org/TR/REC-html40 a'`` and the
+attribute name as if it were ``'http://www.w3.org/TR/REC-html40 href'``.
+
+An older draft of the XML Namespaces proposal is also recognized, but triggers a
+warning.
+
+
+.. seealso::
+
+ `Namespaces in XML <http://www.w3.org/TR/REC-xml-names/>`_
+ This World Wide Web Consortium recommendation describes the proper syntax and
+ processing requirements for namespaces in XML.
+
+.. rubric:: Footnotes
+
+.. [#] Actually, a number of keyword arguments are recognized which influence the
+ parser to accept certain non-standard constructs. The following keyword
+ arguments are currently recognized. The defaults for all of these is ``0``
+ (false) except for the last one for which the default is ``1`` (true).
+ *accept_unquoted_attributes* (accept certain attribute values without requiring
+ quotes), *accept_missing_endtag_name* (accept end tags that look like ``</>``),
+ *map_case* (map upper case to lower case in tags and attributes), *accept_utf8*
+ (allow UTF-8 characters in input; this is required according to the XML
+ standard, but Python does not as yet deal properly with these characters, so
+ this is not the default), *translate_attribute_references* (don't attempt to
+ translate character and entity references in attribute values).
+