Remove DTD validation and use RelaxNG schema validation instead. This allows validation on the local machine without having to do the complicated set up of an XML catalogue. Also, add API to disable validation entirely if it is not desired.
Remove DTD validation and use RelaxNG schema validation instead. This allows validation on the local machine without having to do the complicated set up of an XML catalogue. Also, add API to disable validation entirely if it is not desired.

svn commit r20634

silverorange/swat,silverorange/swat