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  }
  
  # _uri_split taken from URI::Split by Gisle Aas, Copyright 2003
  sub _uri_split {
       return $_[0] =~ m,(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?,;
  }
  
  sub url {
      my ($self,$key,$value) = @_;
      if(defined $value) {
        my ($scheme, $auth, $path, $query, $frag) = _uri_split($value);
        unless ( defined $scheme && length $scheme ) {
          $self->_error( "'$value' for '$key' does not have a URL scheme" );
          return 0;
        }
        unless ( defined $auth && length $auth ) {
          $self->_error( "'$value' for '$key' does not have a URL authority" );
          return 0;
        }
        return 1;
      }