<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def after(self, i, sibling, name=None):
 """Adds siblings after the current tag."""

        self.parent._insert(sibling, idx=self._own_index + 1 + i, name=name)
        return self