code: function( queryOptions, callback ) {
  		if ( typeof queryOptions === 'function' ) {
  			callback = queryOptions;
  			queryOptions = {};
  		}
  		this.capabilities( queryOptions, function( err, capabilities ) {
  			if ( err ) {
  				debug( 'Error getting service metadata: %j', err );
  				return callback( err );
  			}
  			callback( null, capabilities.service );
  		} );
  	}
docs: Gets the WMS service metadata reported in the capabilities as a plain object
  
  @param {Object} [Optional] queryOptions. Options passed as GET parameters
  @param {Function} callback.
  - {Error} null if nothing bad happened
  - {Array} WMS Service metadata as a Plain Object