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<H2><A NAME="sec:2.3"><SPAN class="sec-nr">2.3</SPAN> <SPAN class="sec-title">Optional
arguments</SPAN></A></H2>
<P><A NAME="idx:defaultarguments:44"></A><A NAME="idx:optionalarguments:45"></A><A NAME="idx:argumentoptional:46"></A>Arguments
to <font size=-1>XPCE</font> methods are identified by their position.
Many methods have both obligatory and optional arguments. If obligatory
arguments are omitted <font size=-1>XPCE</font> will generate an error.
If optional arguments are omitted <font size=-1>XPCE</font> fills the
argument with the constant
<A NAME="idx:default:47"></A><B>@default</B>. The interpretation of <A NAME="idx:default:48"></A><B>@default</B>
is left to the implementation of the receiving method. See also <A class="sec" href="online.html">chapter
3</A>.
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