<boost/url/rfc/relative_ref_rule.hpp>
constexpr /* implementation-defined */ relative_ref_rule = {};
using value_type = url_view;
Rules are used with the function grammar::parse.
system::result< url_view > rv = grammar::parse( "images/dot.gif?v=hide#a", relative_ref_rule );
relative-ref = relative-part [ "?" query ] [ "#" fragment ]