<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def dc_element(self, parent, name, text):
 """Add DC element `name` containing `text` to `parent`."""

        if self.dc_uri in self.namespaces:
            dcel = SchemaNode(self.namespaces[self.dc_uri] + ":" + name,
                              text=text)
            parent.children.insert(0,dcel)