I'm not sure if this is the right place to file a bug on the DFDL lessons, so if there's a more appropriate place, 
please direct me towards it.

An error exists in the final example DFDL in Lesson 3. The <xs:schema> tag should not have a closing slash in the 
opening tag.

Additionally, throughout the examples in the lessons, it would be beneficial to not omit attributes of the schema tag as
 shown by the elipsis. The ommitted text is relatively small and by removing the attributes, the example code is no 
longer usable as-is.