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<H2>
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12.1.2 Formatter Implementations 
</H2>

<P>
Two implementations of formatter objects are provided by this module.
Most applications may use one of these classes without modification or
subclassing.

<P>
<dl><dt><b><a name='l2h-2328'><tt class='class'>NullFormatter</tt></a></b> (<big>[</big><var>writer</var><big>]</big>)
<dd>
A formatter which does nothing.  If <var>writer</var> is omitted, a
<tt class="class">NullWriter</tt> instance is created.  No methods of the writer are
called by <tt class="class">NullFormatter</tt> instances.  Implementations should
inherit from this class if implementing a writer interface but don't
need to inherit any implementation.
</dl>

<P>
<dl><dt><b><a name='l2h-2329'><tt class='class'>AbstractFormatter</tt></a></b> (<var>writer</var>)
<dd>
The standard formatter.  This implementation has demonstrated wide
applicability to many writers, and may be used directly in most
circumstances.  It has been used to implement a full-featured
world-wide web browser.
</dl>

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