by zero or more
letters, numbers, dollar signs, and underscores.<p>

After an optional <tt>package</tt> declaration, there can be zero or more 
<tt>import</tt> declarations. As in a Java program these have the form:

</p><pre><tt>    import <i>package_name.class_name</i>;</tt>
</pre>
or
<pre><tt>    import <i>package_name</i>.*;</tt>
</pre>

The package declaration indicates what package the <tt>sym</tt> and 
<tt>parser</tt> classes that are generated by the system will be in.  
Any import declarations that