@property<EOL><INDENT>def node_pairing(self):<DEDENT>
value = self.attributes['<STR_LIT>']<EOL>if value not in IMB.NODE_PAIRING:<EOL><INDENT>msg = '<STR_LIT>'<EOL>msg = msg.format('<STR_LIT>', value, IMB.NODE_PAIRING)<EOL>raise ValueError(msg)<EOL><DEDENT>return value<EOL>
if "node" then test current node and next one
        if "tag", then create tests for every pair of the current tag.