anchor.diff:  }
   
   class Article extends PersistentObject {
  -  String get type => 'Article';
  +  String get dbType => 'Article';
     
     String get title() => getProperty('title');
     set title(String value) => setProperty('title',value);
  
positive.code: 
  
  
  class User extends PersistentObject {
    String get type => 'User';
    
    String get name() => getProperty('name');
    set name(String value) => setProperty('name',value);
  
negative.code: const DefaultUri = '127.0.0.1:8080';
  
  class Author extends PersistentObject  {
    String get dbType => 'Author';
    String get name() => getProperty('name');
    set name(String value) => setProperty('name',value);
    
  