import java.util.List
entity Person {
    name: String
    firstName: String
    friends: List<Person>
    address : Address
    op getFullName() : String {
        return firstName + " " + name;
    }
    
    op getFriendsSortedByFullName() : List<Person> {
        return friends.sortBy[ f | f.fullName ]
    }
}

entity Address {
    street: String
    zip: String
    city: String
}

grammar org.eclipse.xtext.example.domainmodel.Domainmodel with
                                      org.eclipse.xtext.xbase.Xbase
 
generate domainmodel "http://www.xtext.org/example/Domainmodel"
 
Domainmodel:
    importSection=XImportSection?
    elements+=AbstractElement*;
 
AbstractElement:
    PackageDeclaration | Entity;
 
PackageDeclaration:
    'package' name=QualifiedName '{'
        elements+=AbstractElement*
    '}';
 
Entity:
    'entity' name=ValidID ('extends' superType=JvmTypeReference)? '{'
        features+=Feature*
    '}';
 
Feature:
    Property | Operation;
 
Property:
    name=ValidID ':' type=JvmTypeReference;
 
Operation:
    'op' name=ValidID 
        '('(params+=FullJvmFormalParameter 
        (',' params+=FullJvmFormalParameter)*)?')'
        ':' type=JvmTypeReference 
    body=XBlockExpression;