@rule('<STR_LIT>')<EOL><INDENT>def visit_next_unnamed_args(self, _, children):<DEDENT>
return children<EOL>
Unnamed arguments of a filter following the first one.

        Arguments
        ---------
        _ (node) : parsimonious.nodes.Node.
        children : list
            - 1: list of instances of ``.resources.PosArg``.

        Returns
        -------
        list(.resources.PosArg)
            Instances of ``.resources.PosArg``.

        Example
        -------

        >>> UnnamedArgsParserMixin(r'', default_rule='NEXT_UNNAMED_ARGS').data
        []
        >>> UnnamedArgsParserMixin(r', 1', default_rule='NEXT_UNNAMED_ARGS').data
        [1]
        >>> UnnamedArgsParserMixin(r' , 1, 2', default_rule='NEXT_UNNAMED_ARGS').data
        [1, 2]
        >>> UnnamedArgsParserMixin(r' ,1,null, "foo"', default_rule='NEXT_UNNAMED_ARGS').data
        [1, None, "foo"]