+<DD>Returns the argument by its name if found, NULL otherwise. Where the
+ Argument is a common interface for <A HREF="../../compbio/metadata/Option.html" title="class in compbio.metadata"><CODE>Option</CODE></A> and <A HREF="../../compbio/metadata/Parameter.html" title="class in compbio.metadata"><CODE>Parameter</CODE></A>
+ therefore this method can return either. If you need to retrieve the
+ Option by its optionNames use @link
+ <A HREF="../../compbio/metadata/RunnerConfig.html#getArgumentByOptionName(java.lang.String)"><CODE>getArgumentByOptionName(String)</CODE></A> method. The
+ difference between option name and optionName is explained by the
+ following example:
+
+ <pre>
+ <name>Sequence type</name>
+ <description>
+ --nuc - Assume the sequences are nucleotide.
+ --amino - Assume the sequences are amino acid. </description>
+ <optionNames>--amino</optionNames>
+ <optionNames>--nuc</optionNames>
+ <optionNames>--auto</optionNames>
+ </pre>
+
+ In the example, the "Sequence type" is a name whereas --amino, --nuc and
+ --auto are all optionNames. This dichotomy only manifests in
+ <code>Option</code> never in <code>Parameters</code> as the latter can
+ only have single <optioNames> element\r