code: function getPageLinksInfo(serviceRegistry, serviceName) {
  		return _readPageLinksMetadata(serviceRegistry, serviceName).then(function(metadata) {
  			return new PageLinksInfo(metadata);
  		});
  	}
docs: Reads metadata from an <code>orion.page.xxxxx</code> service extension.
  @memberOf orion.PageLinks
  @function
  @param {orion.ServiceRegistry} serviceRegistry The service registry.
  @param {String} [serviceName="orion.page.link"] Service name to read extensions from.
  @return {orion.Promise} A promise that resolves to an {@link orion.PageLinks.PageLinksInfo} object.