@rule('<STR_LIT>')<EOL><INDENT>def visit_next_named_arg(self, _, children):<DEDENT>
return children[<NUM_LIT:1>]<EOL>
Named argument of a filter following a previous one (so, preceded by a comma).

        Arguments
        ---------
        _ (node) : parsimonious.nodes.Node.
        children : list
            - 0: for ``COM`` (comma): ``None``.
            - 1: for ``NAMED_ARG``: instance of ``.resources.NamedArg``.

        Returns
        -------
        .resources.NamedArg
            Instance of ``.resources.NamedArg``.

        Example
        -------

        >>> NamedArgsParserMixin(r',foo= 1', default_rule='NEXT_NAMED_ARG').data
        foo=1
        >>> NamedArgsParserMixin(r' ,bar="BAZ"', default_rule='NEXT_NAMED_ARG').data
        bar="BAZ"
        >>> NamedArgsParserMixin(r', quz=null', default_rule='NEXT_NAMED_ARG').data
        quz=None
        >>> NamedArgsParserMixin(r', quz=TRUE', default_rule='NEXT_NAMED_ARG').data
        quz=True
        >>> NamedArgsParserMixin(r', quz=False', default_rule='NEXT_NAMED_ARG').data
        quz=False