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<title>13.8 xml.sax.xmlreader -- Interface for XML parsers</title>
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<H1><A NAME="SECTION0015800000000000000000">
13.8 <tt class="module">xml.sax.xmlreader</tt> --
         Interface for XML parsers</A>
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<P>


<P>
New in version 2.0.

<P>
SAX parsers implement the <tt class="class">XMLReader</tt> interface. They are
implemented in a Python module, which must provide a function
<tt class="function">create_parser()</tt>. This function is invoked by 
<tt class="function">xml.sax.make_parser()</tt> with no arguments to create a new 
parser object.

<P>
<dl><dt><b><a name='l2h-2688'><tt class='class'>XMLReader</tt></a></b> ()
<dd>
  Base class which can be inherited by SAX parsers.
</dl>

<P>
<dl><dt><b><a name='l2h-2689'><tt class='class'>IncrementalParser</tt></a></b> ()
<dd>
  In some cases, it is desirable not to parse an input source at once,
  but to feed chunks of the document as they get available. Note that
  the reader will normally not read the entire file, but read it in
  chunks as well; still <tt class="method">parse()</tt> won't return until the entire
  document is processed. So these interfaces should be used if the
  blocking behaviour of <tt class="method">parse()</tt> is not desirable.

<P>
When the parser is instantiated it is ready to begin accepting data
  from the feed method immediately. After parsing has been finished
  with a call to close the reset method must be called to make the
  parser ready to accept new data, either from feed or using the parse
  method.

<P>
Note that these methods must <i>not</i> be called during parsing,
  that is, after parse has been called and before it returns.

<P>
By default, the class also implements the parse method of the
  XMLReader interface using the feed, close and reset methods of the
  IncrementalParser interface as a convenience to SAX 2.0 driver
  writers.
</dl>

<P>
<dl><dt><b><a name='l2h-2690'><tt class='class'>Locator</tt></a></b> ()
<dd>
  Interface for associating a SAX event with a document location. A
  locator object will return valid results only during calls to
  DocumentHandler methods; at any other time, the results are
  unpredictable. If information is not available, methods may return
  <code>None</code>.
</dl>

<P>
<dl><dt><b><a name='l2h-2691'><tt class='class'>InputSource</tt></a></b> (<big>[</big><var>systemId</var><big>]</big>)
<dd>
  Encapsulation of the information needed by the <tt class="class">XMLReader</tt> to
  read entities.

<P>
This class may include information about the public identifier,
  system identifier, byte stream (possibly with character encoding
  information) and/or the character stream of an entity.

<P>
Applications will create objects of this class for use in the
  <tt class="method">XMLReader.parse()</tt> method and for returning from
  EntityResolver.resolveEntity.

<P>
An <tt class="class">InputSource</tt> belongs to the application, the
  <tt class="class">XMLReader</tt> is not allowed to modify <tt class="class">InputSource</tt> objects
  passed to it from the application, although it may make copies and
  modify those.
</dl>

<P>
<dl><dt><b><a name='l2h-2692'><tt class='class'>AttributesImpl</tt></a></b> (<var>attrs</var>)
<dd>
  This is a dictionary-like object which represents the element
  attributes in a <tt class="method">startElement()</tt> call. In addition to the
  most useful dictionary operations, it supports a number of other
  methods as described below. Objects of this class should be
  instantiated by readers; <var>attrs</var> must be a dictionary-like
  object.
</dl>

<P>
<dl><dt><b><a name='l2h-2693'><tt class='class'>AttributesNSImpl</tt></a></b> (<var>attrs, qnames</var>)
<dd>
  Namespace-aware variant of attributes, which will be passed to
  <tt class="method">startElementNS()</tt>. It is derived from <tt class="class">AttributesImpl</tt>,
  but understands attribute names as two-tuples of <var>namespaceURI</var>
  and <var>localname</var>. In addition, it provides a number of methods
  expecting qualified names as they appear in the original document.
</dl>

<P>

<p><hr>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>

<UL>
<LI><A NAME="tex2html4944"
  href="xmlreader-objects.html" tppabs="http://www.python.org/doc/current/lib/xmlreader-objects.html">13.8.1 XMLReader Objects </A>
<LI><A NAME="tex2html4945"
  href="incremental-parser-objects.html" tppabs="http://www.python.org/doc/current/lib/incremental-parser-objects.html">13.8.2 IncrementalParser Objects
            </A>
<LI><A NAME="tex2html4946"
  href="locator-objects.html" tppabs="http://www.python.org/doc/current/lib/locator-objects.html">13.8.3 Locator Objects </A>
<LI><A NAME="tex2html4947"
  href="input-source-objects.html" tppabs="http://www.python.org/doc/current/lib/input-source-objects.html">13.8.4 InputSource Objects </A>
<LI><A NAME="tex2html4948"
  href="attributes-impl-objects.html" tppabs="http://www.python.org/doc/current/lib/attributes-impl-objects.html">13.8.5 AttributesImpl Objects </A>
<LI><A NAME="tex2html4949"
  href="attributes-ns-impl-objects.html" tppabs="http://www.python.org/doc/current/lib/attributes-ns-impl-objects.html">13.8.6 AttributesNSImpl Objects </A>
</UL>
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