code: function createNodeHandlerSpec( routeDefinition, resource ) {
  
  	const handler = {
  		// A "path" is an ordered (by key) set of values composed into the final URL
  		_path: {
  			'0': resource,
  		},
  
  		// A "level" is a level-keyed object representing the valid options for
  		// one level of the resource URL
  		_levels: {},
  
  		// Objects that hold methods and properties which will be copied to
  		// instances of this endpoint's handler
  		_setters: {},
  
  		// Arguments (query parameters) that may be set in GET requests to endpoints
  		// nested within this resource route tree, used to determine the mixins to
  		// add to the request handler
  		_getArgs: routeDefinition._getArgs,
  	};
  
  	// Walk the tree
  	Object.keys( routeDefinition ).forEach( ( routeDefProp ) => {
  		if ( routeDefProp !== '_getArgs' ) {
  			extractSetterFromNode( handler, routeDefinition[ routeDefProp ] );
  		}
  	} );
  
  	return handler;
  }
docs: Create a node handler specification object from a route definition object
  
  @name create
  @param {object} routeDefinition A route definition object
  @param {string} resource The string key of the resource for which to create a handler
  @returns {object} A handler spec object with _path, _levels and _setters properties