//creates a parallel tree -- should NOT retain references into old tree
public XObject ShallowCopy()
{
XObject copy = NewInstance();
copy.ShallowCopyFrom(this);
return(copy);
}
//creates a parallel tree -- should NOT retain references into old tree
public XObject ShallowCopy()
{
XObject copy = NewInstance();
Debug.Assert(copy.GetType() == this.GetType());
copy.ShallowCopyFrom(this);
Debug.Assert(copy.region == this.region);
return(copy);
}