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<H1><A NAME="SECTION0015900000000000000000">
13.9 <tt class="module">xml.sax</tt> --
         Support for SAX2 parsers</A>
</H1>

<P>
<A NAME="module-xml.sax"></A>

<P>

<span class="versionnote">New in version 2.0.</span>

<P>
The <tt class="module">xml.sax</tt> package provides a number of modules which
implement the Simple API for XML (SAX) interface for Python.  The
package itself provides the SAX exceptions and the convenience
functions which will be most used by users of the SAX API.

<P>
The convenience functions are:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4463' xml:id='l2h-4463' class="function">make_parser</tt></b>(</nobr></td>
  <td><var></var><big>[</big><var>parser_list</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  Create and return a SAX <tt class="class">XMLReader</tt> object.  The first parser
  found will be used.  If <var>parser_list</var> is provided, it must be a
  sequence of strings which name modules that have a function named
  <tt class="function">create_parser()</tt>.  Modules listed in <var>parser_list</var>
  will be used before modules in the default list of parsers.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4464' xml:id='l2h-4464' class="function">parse</tt></b>(</nobr></td>
  <td><var>filename_or_stream, handler</var><big>[</big><var>, error_handler</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  Create a SAX parser and use it to parse a document.  The document,
  passed in as <var>filename_or_stream</var>, can be a filename or a file
  object.  The <var>handler</var> parameter needs to be a SAX
  <tt class="class">ContentHandler</tt> instance.  If <var>error_handler</var> is given,
  it must be a SAX <tt class="class">ErrorHandler</tt> instance; if omitted, 
  <tt class="exception">SAXParseException</tt> will be raised on all errors.  There
  is no return value; all work must be done by the <var>handler</var>
  passed in.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-4465' xml:id='l2h-4465' class="function">parseString</tt></b>(</nobr></td>
  <td><var>string, handler</var><big>[</big><var>, error_handler</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  Similar to <tt class="function">parse()</tt>, but parses from a buffer <var>string</var>
  received as a parameter.
</dl>

<P>
A typical SAX application uses three kinds of objects: readers,
handlers and input sources.  ``Reader'' in this context is another
term for parser, i.e. some piece of code that reads the bytes or
characters from the input source, and produces a sequence of events.
The events then get distributed to the handler objects, i.e. the
reader invokes a method on the handler.  A SAX application must
therefore obtain a reader object, create or open the input sources,
create the handlers, and connect these objects all together.  As the
final step of preparation, the reader is called to parse the input.
During parsing, methods on the handler objects are called based on
structural and syntactic events from the input data.

<P>
For these objects, only the interfaces are relevant; they are normally
not instantiated by the application itself.  Since Python does not have
an explicit notion of interface, they are formally introduced as
classes, but applications may use implementations which do not inherit
from the provided classes.  The <tt class="class">InputSource</tt>, <tt class="class">Locator</tt>,
<tt class="class">Attributes</tt>, <tt class="class">AttributesNS</tt>, and
<tt class="class">XMLReader</tt> interfaces are defined in the module
<tt class="module"><a href="module-xml.sax.xmlreader.html">xml.sax.xmlreader</a></tt>.  The handler interfaces are defined in
<tt class="module"><a href="module-xml.sax.handler.html">xml.sax.handler</a></tt>.  For convenience, <tt class="class">InputSource</tt>
(which is often instantiated directly) and the handler classes are
also available from <tt class="module">xml.sax</tt>.  These interfaces are described
below.

<P>
In addition to these classes, <tt class="module">xml.sax</tt> provides the following
exception classes.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-4466' xml:id='l2h-4466' class="exception">SAXException</tt></b>(</nobr></td>
  <td><var>msg</var><big>[</big><var>, exception</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  Encapsulate an XML error or warning.  This class can contain basic
  error or warning information from either the XML parser or the
  application: it can be subclassed to provide additional
  functionality or to add localization.  Note that although the
  handlers defined in the <tt class="class">ErrorHandler</tt> interface receive
  instances of this exception, it is not required to actually raise
  the exception -- it is also useful as a container for information.

<P>
When instantiated, <var>msg</var> should be a human-readable description
  of the error.  The optional <var>exception</var> parameter, if given,
  should be <code>None</code> or an exception that was caught by the parsing
  code and is being passed along as information.

<P>
This is the base class for the other SAX exception classes.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-4467' xml:id='l2h-4467' class="exception">SAXParseException</tt></b>(</nobr></td>
  <td><var>msg, exception, locator</var>)</td></tr></table></dt>
<dd>
  Subclass of <tt class="exception">SAXException</tt> raised on parse errors.
  Instances of this class are passed to the methods of the SAX
  <tt class="class">ErrorHandler</tt> interface to provide information about the
  parse error.  This class supports the SAX <tt class="class">Locator</tt> interface
  as well as the <tt class="class">SAXException</tt> interface.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-4468' xml:id='l2h-4468' class="exception">SAXNotRecognizedException</tt></b>(</nobr></td>
  <td><var>msg</var><big>[</big><var>, exception</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  Subclass of <tt class="exception">SAXException</tt> raised when a SAX
  <tt class="class">XMLReader</tt> is confronted with an unrecognized feature or
  property.  SAX applications and extensions may use this class for
  similar purposes.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">exception</span>&nbsp;<tt id='l2h-4469' xml:id='l2h-4469' class="exception">SAXNotSupportedException</tt></b>(</nobr></td>
  <td><var>msg</var><big>[</big><var>, exception</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
  Subclass of <tt class="exception">SAXException</tt> raised when a SAX
  <tt class="class">XMLReader</tt> is asked to enable a feature that is not
  supported, or to set a property to a value that the implementation
  does not support.  SAX applications and extensions may use this
  class for similar purposes.
</dl>

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

  <dl compact="compact" class="seetitle">
    <dt><em class="citetitle"><a href="http://www.saxproject.org/"
        >SAX: The Simple API for
            XML</a></em></dt>
    <dd>This site is the focal point for the definition of
            the SAX API.  It provides a Java implementation and online
            documentation.  Links to implementations and historical
            information are also available.</dd>
  </dl>

<P>
<dl compact="compact" class="seemodule">
    <dt>Module <b><tt class="module"><a href="module-xml.sax.handler.html">xml.sax.handler</a></tt>:</b>
    <dd>Definitions of the interfaces for
             application-provided objects.
  </dl>

<P>
<dl compact="compact" class="seemodule">
    <dt>Module <b><tt class="module"><a href="module-xml.sax.saxutils.html">xml.sax.saxutils</a></tt>:</b>
    <dd>Convenience functions for use in SAX
             applications.
  </dl>

<P>
<dl compact="compact" class="seemodule">
    <dt>Module <b><tt class="module"><a href="module-xml.sax.xmlreader.html">xml.sax.xmlreader</a></tt>:</b>
    <dd>Definitions of the interfaces for
             parser-provided objects.
  </dl>
</div>

<P>

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	55	<H1><A NAME="SECTION0015900000000000000000">
	56	13.9 <tt class="module">xml.sax</tt> --
	57	Support for SAX2 parsers</A>
	58	</H1>
	59
	60	<P>
	61	<A NAME="module-xml.sax"></A>
	62
	63	<P>
	64
65	<span class="versionnote">New in version 2.0.</span>
66
67	<P>
68	The <tt class="module">xml.sax</tt> package provides a number of modules which
69	implement the Simple API for XML (SAX) interface for Python. The
70	package itself provides the SAX exceptions and the convenience
71	functions which will be most used by users of the SAX API.
72
73	<P>
74	The convenience functions are:
75
76	<P>
77	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
78	<td><nobr><b><tt id='l2h-4463' xml:id='l2h-4463' class="function">make_parser</tt></b>(</nobr></td>
79	<td><var></var><big>[</big><var>parser_list</var><big>]</big><var></var>)</td></tr></table></dt>
80	<dd>
81	Create and return a SAX <tt class="class">XMLReader</tt> object. The first parser
82	found will be used. If <var>parser_list</var> is provided, it must be a
83	sequence of strings which name modules that have a function named
84	<tt class="function">create_parser()</tt>. Modules listed in <var>parser_list</var>
85	will be used before modules in the default list of parsers.
86	</dl>
87
88	<P>
89	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
90	<td><nobr><b><tt id='l2h-4464' xml:id='l2h-4464' class="function">parse</tt></b>(</nobr></td>
91	<td><var>filename_or_stream, handler</var><big>[</big><var>, error_handler</var><big>]</big><var></var>)</td></tr></table></dt>
92	<dd>
93	Create a SAX parser and use it to parse a document. The document,
94	passed in as <var>filename_or_stream</var>, can be a filename or a file
95	object. The <var>handler</var> parameter needs to be a SAX
96	<tt class="class">ContentHandler</tt> instance. If <var>error_handler</var> is given,
97	it must be a SAX <tt class="class">ErrorHandler</tt> instance; if omitted,
98	<tt class="exception">SAXParseException</tt> will be raised on all errors. There
99	is no return value; all work must be done by the <var>handler</var>
100	passed in.
101	</dl>
102
103	<P>
104	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
105	<td><nobr><b><tt id='l2h-4465' xml:id='l2h-4465' class="function">parseString</tt></b>(</nobr></td>
106	<td><var>string, handler</var><big>[</big><var>, error_handler</var><big>]</big><var></var>)</td></tr></table></dt>
107	<dd>
108	Similar to <tt class="function">parse()</tt>, but parses from a buffer <var>string</var>
109	received as a parameter.
110	</dl>
111
112	<P>
113	A typical SAX application uses three kinds of objects: readers,
114	handlers and input sources. ``Reader'' in this context is another
115	term for parser, i.e. some piece of code that reads the bytes or
116	characters from the input source, and produces a sequence of events.
117	The events then get distributed to the handler objects, i.e. the
118	reader invokes a method on the handler. A SAX application must
119	therefore obtain a reader object, create or open the input sources,
120	create the handlers, and connect these objects all together. As the
121	final step of preparation, the reader is called to parse the input.
122	During parsing, methods on the handler objects are called based on
123	structural and syntactic events from the input data.
124
125	<P>
126	For these objects, only the interfaces are relevant; they are normally
127	not instantiated by the application itself. Since Python does not have
128	an explicit notion of interface, they are formally introduced as
129	classes, but applications may use implementations which do not inherit
130	from the provided classes. The <tt class="class">InputSource</tt>, <tt class="class">Locator</tt>,
131	<tt class="class">Attributes</tt>, <tt class="class">AttributesNS</tt>, and
132	<tt class="class">XMLReader</tt> interfaces are defined in the module
133	<tt class="module"><a href="module-xml.sax.xmlreader.html">xml.sax.xmlreader</a></tt>. The handler interfaces are defined in
134	<tt class="module"><a href="module-xml.sax.handler.html">xml.sax.handler</a></tt>. For convenience, <tt class="class">InputSource</tt>
135	(which is often instantiated directly) and the handler classes are
136	also available from <tt class="module">xml.sax</tt>. These interfaces are described
137	below.
138
139	<P>
140	In addition to these classes, <tt class="module">xml.sax</tt> provides the following
141	exception classes.
142
143	<P>
144	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
145	<td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-4466' xml:id='l2h-4466' class="exception">SAXException</tt></b>(</nobr></td>
146	<td><var>msg</var><big>[</big><var>, exception</var><big>]</big><var></var>)</td></tr></table></dt>
147	<dd>
148	Encapsulate an XML error or warning. This class can contain basic
149	error or warning information from either the XML parser or the
150	application: it can be subclassed to provide additional
151	functionality or to add localization. Note that although the
152	handlers defined in the <tt class="class">ErrorHandler</tt> interface receive
153	instances of this exception, it is not required to actually raise
154	the exception -- it is also useful as a container for information.
155
156	<P>
157	When instantiated, <var>msg</var> should be a human-readable description
158	of the error. The optional <var>exception</var> parameter, if given,
159	should be <code>None</code> or an exception that was caught by the parsing
160	code and is being passed along as information.
161
162	<P>
163	This is the base class for the other SAX exception classes.
164	</dl>
165
166	<P>
167	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
168	<td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-4467' xml:id='l2h-4467' class="exception">SAXParseException</tt></b>(</nobr></td>
169	<td><var>msg, exception, locator</var>)</td></tr></table></dt>
170	<dd>
171	Subclass of <tt class="exception">SAXException</tt> raised on parse errors.
172	Instances of this class are passed to the methods of the SAX
173	<tt class="class">ErrorHandler</tt> interface to provide information about the
174	parse error. This class supports the SAX <tt class="class">Locator</tt> interface
175	as well as the <tt class="class">SAXException</tt> interface.
176	</dl>
177
178	<P>
179	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
180	<td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-4468' xml:id='l2h-4468' class="exception">SAXNotRecognizedException</tt></b>(</nobr></td>
181	<td><var>msg</var><big>[</big><var>, exception</var><big>]</big><var></var>)</td></tr></table></dt>
182	<dd>
183	Subclass of <tt class="exception">SAXException</tt> raised when a SAX
184	<tt class="class">XMLReader</tt> is confronted with an unrecognized feature or
185	property. SAX applications and extensions may use this class for
186	similar purposes.
187	</dl>
188
189	<P>
190	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
191	<td><nobr><b><span class="typelabel">exception</span> <tt id='l2h-4469' xml:id='l2h-4469' class="exception">SAXNotSupportedException</tt></b>(</nobr></td>
192	<td><var>msg</var><big>[</big><var>, exception</var><big>]</big><var></var>)</td></tr></table></dt>
193	<dd>
194	Subclass of <tt class="exception">SAXException</tt> raised when a SAX
195	<tt class="class">XMLReader</tt> is asked to enable a feature that is not
196	supported, or to set a property to a value that the implementation
197	does not support. SAX applications and extensions may use this
198	class for similar purposes.
199	</dl>
200
201	<P>
202	<div class="seealso">
203	<p class="heading">See Also:</p>
204
205	<dl compact="compact" class="seetitle">
206	<dt><em class="citetitle"><a href="http://www.saxproject.org/"
207	>SAX: The Simple API for
208	XML</a></em></dt>
209	<dd>This site is the focal point for the definition of
210	the SAX API. It provides a Java implementation and online
211	documentation. Links to implementations and historical
212	information are also available.</dd>
213	</dl>
214
215	<P>
216	<dl compact="compact" class="seemodule">
217	<dt>Module <b><tt class="module"><a href="module-xml.sax.handler.html">xml.sax.handler</a></tt>:</b>
218	<dd>Definitions of the interfaces for
219	application-provided objects.
220	</dl>
221
222	<P>
223	<dl compact="compact" class="seemodule">
224	<dt>Module <b><tt class="module"><a href="module-xml.sax.saxutils.html">xml.sax.saxutils</a></tt>:</b>
225	<dd>Convenience functions for use in SAX
226	applications.
227	</dl>
228
229	<P>
230	<dl compact="compact" class="seemodule">
231	<dt>Module <b><tt class="module"><a href="module-xml.sax.xmlreader.html">xml.sax.xmlreader</a></tt>:</b>
232	<dd>Definitions of the interfaces for
233	parser-provided objects.
234	</dl>
235	</div>
236
237	<P>
238
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240	<div class='online-navigation'>
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242	<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
243
244	<UL CLASS="ChildLinks">
245	<LI><A href="sax-exception-objects.html">13.9.1 SAXException Objects</a>
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284	<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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