You have iRite create the xml file for you. Basically create a test.css file and the class definition to it, for Example:
.border1 {
border-style:solid;
border-color:#063;
border-width:1px;
}
and then in iRite, click on the styling tab and browse for the test.css file and select the border1 class. After clicking OK and previewing the page you should see something like this:
<p><span class="border1">test</span></p>
when applying the class.