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<H2><A NAME="SECTION0014420000000000000000"></A>
<BR>
12.4.2 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-1952"><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-1953"><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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