JTidy not showing all warnings or errors

When I provide a url to jtidy, it has done the job to output the corrected xhtml file, however, I would be more interested in checking the error/warning output. Since I notice that jtidy has changed all the wrong bits on the page, but without outputing all the changes made to the error file. Is there a property that I can set to make it output all the changes made?
 
Also, is jtidy validating against a DTD file or it just has set of built in rules which it runs against?
 
Thanks in advance.
Futomaki
 
 


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