boost::spirit

{ text (not code) has been formatted to make lines ~70 chars. -mod }

Consider

# include <iostream>
# include <string>
# include <map>
# include <vector>

# include <boost/random/random_device.hpp>
# include <boost/random/uniform_int_distribution.hpp>
# include <boost/foreach.hpp>
# include <boost/tokenizer.hpp>
# include <boost/algorithm/string.hpp>
# include <boost/spirit/include/qi.hpp>
# include <boost/spirit/include/karma.hpp>
# include <boost/fusion/adapted/std_pair.hpp>
# include <boost/random/mersenne_twister.hpp>
# include <boost/random/uniform_int_distribution.hpp>

int main( ) {

  std::string text
      ( "time=10.000,21.000&checksum=100,200&uLeftLat .000,\
         uLeftLon=21.000,bRightLat=21.00,bRightLon=22.000&mid=Blue Rain");
  using namespace boost::spirit ;

  typedef std::map < std::string, std::string > STR_MAP ;
  STR_MAP contents;
  std::string::iterator first = text.begin() ;
  std::string::iterator last = text.end() ;
  const bool result = qi::phrase_parse
            ( first, last,
             *( * ( qi::char_-"=") >> qi::lit ( "=") >>
             * ( qi::char_-"," ) >> -qi::lit(",") ) , ascii::space, contents ) ;
  std::cout << " result = " << result << ", output Size = " << contents.size() << std::endl;
  if ( !result ) {
    std::cin.get();
    return EXIT_FAILURE ;
  }
  for ( STR_MAP::iterator it = contents.begin();
        it != contents.end(); ++it ){
    std::cout << it->first << " " << it->second << std::endl;
  }
  std::cin.get();

}
                    

The map output currently is as follows:

200&uLeftLat 20.000
21.000&checksum 100
bRightLat 21.00
bRightLon 22.000&mid=BlueRain
time 10.000
uLeftLon 21.000

What I want is this :
  time 10.000 21.000
  checksum 100 200
  uLeftLat 20.000
  uLeftLon 21.000
  bRightLat 21.00
  bRightLon 22.000
  mid Blue Rain

Having a hard time filtering on the ampersand. What's the phrase_parse
combination that'll help me achieve the desired output?

NOTE: There's a unique case where the key value pair for timestamp and
checksum might be as follows: key=value1,value2 The end result should
be key value1 value2.
NOTE: checksum and timestamp could also be key=value

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