#9 Re-implement the XML writing of Descriptor using DOM

[Will Gilbert]

Originally the XML workflow descriptors were created using a StringBuffer. A much better method would be to build a DOM and render the XML into a 'Printwriter'.

This code needs to be re-implemented at some point because the XML is first imported into core then the XML is recreated and validated again the DTD.

This step may not be necessary if the XML is validated during input. This needs to be determined.