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  <TITLE>xmlproc and namespaces</TITLE>
  <META NAME="Author"      CONTENT="Lars Marius Garshol">
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  <META NAME="Description" CONTENT="This page documents the namespace support in
	xmlproc.">
  <META NAME="Keywords"    CONTENT="XML, Python, XML parser, namespaces">
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<H1>xmlproc and namespaces</H1>

<P>
xmlproc now supports XML namespaces through the addition of the
xml.parsers.xmlproc.namespace module. In this module there is a
NamespaceFilter class which is implemented as a parser filter.  This
means that it is registered with the parser as an application, and
that your application then registers with the filter as the real
application.
</P>

<P>
The parser will then parse as normal and send parse events to the
NamespaceFilter, which will do namespace transformations and pass the
events on to your application.
</P>

<h2>An example</h2>

<P>
This is an example of how namespace processing can be set up:
</P>

<PRE><CODE>
from xml.parsers.xmlproc import xmlproc,namespace

class MyApplication(xmlproc.Application):
    pass # Add some useful stuff here

p=xmlproc.XMLProcessor()

nsf=namespace.NamespaceFilter(p)
nsf.set_application(MyApplication())
# register error handlers and all other handlers with the parser,
# not the filter

p.set_application(nsf)
p.parse_resource("foo.xml")
</CODE></PRE>

<P>
MyApplication will now receive parse events where all prefixed names
have been processed into names consisting of the namespace URI,
followed by a space and then the local part of the name. If this isn't
clear to you, try using the -n option to xvcmd.py and xpcmd.py and
-o&nbsp;x to see what the filter does.
</P>

<h2>The NamespaceFilter interface</h2>

<P>
This is the complete NamespaceFilter interface:
</P>

<dl>
  <dt><CODE>def __init__(self,parser):</CODE>
  <dd>Creates the filter and gives it a reference to the parser.

<dt><CODE>def set_application(self,app):</CODE>
  <dd>Gives the filter an object to send filtered events to.

<dt><CODE>def set_report_ns_attributes(self,action):</CODE>
  <dd>If action is set to true xmlns attributes are reported to the
  application. If it is set to false they are silently removed.
</dl>

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<ADDRESS>
Last update 2000-05-11 14:20, by 
<a href="mailto:larsga@garshol.priv.no">Lars Marius Garshol</a>.
</ADDRESS>

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