Does anyone have a transform to change comments into annotations in an existing schema?

I am looking to transform comments that precede an element and make those comments as an annotation for that element.

for example:

<!-- Information about foo -->
<xs:element name="foo-group">
.
.
.
</xs:element>

to

<xs:element name="foo-group">
 <xs:annotation>
  <xs:documentation>Information about foo</xs:documentation>
 </xs:annotation>
</xs:element>

I have a bunch of schemas that I need to transform.  

Another issue is:  Does anyone have a way of formatting the annotations?  Through oXygen, I found that I could add schematron elements within the documentation.  The only one that I found useful was <p xmlns="http://purl.oclc.org/dsdl/schematron"></p>

Has anyone used better formatting of annotations?

Thank you,
Loren