DBSAXNode constructor can be simplified
DBSAXNode now takes a DBSAXNode rootnode and a DBSAXDocument currentDoc as part
of the constructor. But really we only need to pass the DBSAXDocument and add
get and set routines for getting the rootnodeid (which is stored in the
document) to the DBSAXDocument class because it already contains the rootnodeid
information that we need.