Diagnostic method for listing out the contents of a C{ParseResults}.
           Accepts an optional C{indent} argument so that this string can be embedded
           in a nested display of other data.

def dump(self,indent='',depth=0):
        """Diagnostic method for listing out the contents of a C{ParseResults}.
           Accepts an optional C{indent} argument so that this string can be embedded
           in a nested display of other data."""
        out = []
        out.append( indent+_ustr(self.asList()) )
        keys = self.items()
        keys.sort()
        for k,v in keys:
            if out:
                out.append('\n')
            out.append( "%s%s- %s: " % (indent,('  '*depth), k) )
            if isinstance(v,ParseResults):
                if v.keys():
                    out.append( v.dump(indent,depth+1) )
                else:
                    out.append(_ustr(v))
            else:
                out.append(_ustr(v))
        return "".join(out)