@staticmethod<EOL><INDENT>def get_peer(tag, node):<DEDENT>
peers = node.findall(tag)<EOL>if len(peers) < <NUM_LIT:1>:<EOL><INDENT>return None<EOL><DEDENT>elif len(peers) > <NUM_LIT:1>:<EOL><INDENT>raise ModelError("<STR_LIT>".format(tag))<EOL><DEDENT>else:<EOL><INDENT>return peers[<NUM_LIT:0>]<EOL><DEDENT>
get_peer

        High-level api: Find all children under the node with the tag.

        Parameters
        ----------

        tag : `str`
            A tag in `{namespace}tagname` notaion.

        node : `Element`
            A node to be looked at.

        Returns
        -------

        Element or None
            None if not found. An Element object when found.