anchor.diff:  <4> returns a list of representations of each of member of each domain class.
   <5> what sort of object a domain type is (or bookmark) represents
   <6> whether to throw an exception or return `Sort.UNKNOWN` if the object type is not recognized.  (The overloads with no `Mode` parameter default to strict mode).
  -
  +<7> (As of `1.16.0-SNAPSHOT`), returns the `AppManifest` used to bootstrap the application.
  +If an `AppManifest2` was used (from a `Module`), then this is also returned (else just `null`).
   
   == Implementation
   
  
positive.code: [[_rgsvc_metadata-api_MetamodelService]]
  = `MetaModelService3`
  :Notice: Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at. http://www.apache.org/licenses/LICENSE-2.0 . Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR  CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
  :_basedir: ../../
  :_imagesdir: images/
  
  
  
  The `MetaModelService3` service provides access to a number of aspects of Apache Isis' internal metamodel.
  
  
  == API
  
negative.code:     }
      Sort sortOf(Class<?> domainType);             // <6>
      Sort sortOf(Bookmark bookmark);
  
      // introduced in MetaModelService3
      Sort sortOf(Class<?> domainType, Mode mode);
      Sort sortOf(Bookmark bookmark, Mode mode);
  
      // introduced in MetaModelService4
      AppManifest getAppManifest();                 // <7>
      AppManifest2 getAppManifest2();
  }
  ----
  <1> reverse lookup of a domain class' object type
  