def pretty_print(self, indent=0):
        """Print the document without tags using indentation
        """

        s = tab = ' '*indent
        s += '%s: ' %self.tag
        if isinstance(self.value, basestring):
            s += self.value
        else:
            s += '\n'
            for e in self.value:
                s += e.pretty_print(indent+4)
        s += '\n'

        return s
Print the document without tags using indentation