 return a MimeBodyPart object to represent a
 body part parsed from the InputStream.  Subclasses can override
 this method to return a subclass of MimeBodyPart, if
 necessary.  This implementation simply constructs and returns
 a MimeBodyPart object.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>is</code> - InputStream containing the body part</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a MimeBodyPart</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><cod