Annotations

Each entity, attribute or link can have 0 to N annotations. 
Annotations provide additional information usable during the code generation. 
An annotation is a predefined name starting with "@". 
Some annotations may have values specified between "(" and ")". 
For attributes and links all annotations must be located in the block delimited by "{" and "}".
NB : since version 4.0 the useless comma between annotations is prohibited and must be removed
@Abstract
Marks an entity as "abstract" 
Scope : entity  /  Since : 4.0.0
@AggregateRoot
Marks an entity as "aggregate root" (useful to define "DDD aggregates" )
Scope : entity  /  Since : 4.0.0
@AutoIncremented
The attribute is supposed to be auto-incremented (for example for an auto-incremented key)
Only applicable to numeric types
Scope : attribute  /  Since : 2.0.0  
@Cascade(string [, string, ...] ) 
Defines how to manage ORM "cascade" options for a link 
Valid options : ALL or A, MERGE or M, PERSIST or P, REFRESH or REF, REMOVE or REM
Scope : link  /  Since : 4.1.0 
Examples :
 @Cascade(MERGE)  @Cascade(REMOVE)  @Cascade(MERGE,REMOVE)  @Cascade(M,REM) 
@Context(string)
Defines the context to which the entity belongs
Scope : entity  /  Since : 4.0.0
@DbCatalog(string)
Defines the database catalog to which the entity table belongs
Scope : entity  /  Since : 4.0.0
@DbComment(string)
The comment in the database (typically a column comment or table comment in a relational database)
Scope : attribute & entity  /  Since : 3.2.0 for attribute, 4.0.0 for entity
@DbDefaultValue(string)
The default value in the database. 
Scope : attribute  /  Since : 3.2.0 
@DbName(string)
The name in the database (for example the column name in a relational database)
Scope : attribute  /  Since : 3.2.0 
@DbSchema(string)
Defines the database schema to which the entity table belongs
Scope : entity  /  Since : 4.0.0
@DbSize(string)
Deprecated - Do not use
Scope : attribute  /  Since : 3.2.0
@DbTable(string)
Defines the database table associated with the entity
Scope : entity  /  Since : 4.0.0
@DbTablespace(string)
Defines the database tablespace where the entity table is located
Scope : entity  /  Since : 4.0.0
@DbType(string)
The attribute type in the database (for example the column type in a relational database)
Scope : attribute  /  Since : 3.2.0 
@DbView
Marks the entity as a "view" in the database
Scope : entity  /  Since : 4.0.0
@DefaultValue(string)
The default value for an attribute
Scope : attribute  /  Since : 3.2.0 
@Domain(string)
Defines the "domain" to which the entity belongs
Scope : entity  /  Since : 4.0.0
@Embedded
The entity referenced by the attribute must be embedded (typically for NoSQL databases).
Applicable with "references" to embed them in the current entity.
Scope : link  /  Since : 3.0.0
@Extends(string)
Defines the "superclass" of an entity (inheritance)
Scope : entity  /  Since : 4.0.0
@FetchTypeEager
Define an "Eager Loading" fetch type for a link, typically for ORM (JPA, Doctrine, etc ).
Scope : link  /  Since : 3.3.0
@FetchTypeLazy
Define a "Lazy Loading" fetch type for a link, typically for ORM (JPA, Doctrine, etc ).
Scope : link  /  Since : 3.3.0
@FK( [fkName,] referencedEntity[.attribute] )
Define a "Foreign Key" or a "Foreign Key part" 
Scope : attribute  /  Since : 3.3.0

Syntax :
// FK referencing an entity with a basic PK (single attribute)
@FK( ReferencedEntity ) // without FK name (default name)
@FK( ForeignKeyName, ReferencedEntity ) // with FK name
---
// FK referencing an entity with a compositePK (N attributes)
@FK( ForeignKeyName, ReferencedEntity.ReferencedAttribute )

Examples :
// FK referencing "Brand" entity (with default FK name)
brandId : int { @FK(Brand) }; // PK inference 
-----
// FK referencing "Brand" entity (with default FK name)
brandId : int { @FK(Brand.id) }; // explicit PK attribute
-----
// FK referencing "Group" entity (with FK name)
groupCode : string { @FK(FK_EMP_GRP, Group) } ;
-----
// FK referencing "SubGroup" entity (composite PK)
groupCode : string { @FK(FK_PER_SUBGRP, SubGroup.groupCode ) }; 
subgroupId : int   { @FK(FK_PER_SUBGRP, SubGroup.subgroupId) };
@Future
The attribute date value must be in the future (after current date).
Usable for field validation rules. Applicable with "date" type.
Scope : attribute  /  Since : 2.0.0
@GeneratedValue(string [, string, ...])
Defines the generated value strategy ("AUTO", "IDENTITY", SEQUENCE" or "TABLE") for an attribute.
Scope : attribute  /  Since : 3.4.0
Syntax :
@GeneratedValue(AUTO) 
@GeneratedValue(IDENTITY) 
@GeneratedValue(SEQUENCE [, GeneratorName, SequenceName 
  [, AllocationSize ] ]) 
@GeneratedValue(TABLE [, GeneratorName, TableName 
  [, PkColumnName, PkColumnValue, ValueColumnName [, AllocationSize ] ] ])
@Id
The attribute is the "ID" (or "Primary Key") for the current entity.
For an entity with a composite ID (composite Primary Key), put this annotation on each attribute that is part of the ID.
Scope : attribute  /  Since : 1.0.0
Applicable with any basic type.
For a composite Primary Key just put an "@Id" annotation for each attribute that is part of the key.
Examples :
Badge { // Simple key => single "@Id"
  id   : int { @Id } ;
  name : string ; 
}
SubGroup { // Composite key => multiple "@Id"
  groupCode : string { @Id } ;
  sectionId : int { @Id } ;
  name : string ;
}
@InitialValue(string)
Sets the initial value of the attribute.
Scope : attribute  /  Since : 3.2.0
@InMemoryRepository
Marks an entity as fully stored in memory.
All occurrences can be accessed directly in memory (can be useful for static datasets).
Scope : entity  /  Since : 4.0.0
@InputType(string)
Defines the input type usable for a field (for example an HTML input type).
Scope : attribute  /  Since : 3.2.0
@Insertable(boolean) 
Defines if the link is "insertable" or not.  
Scope : link  /  Since : 3.3.0
Examples : 
@Insertable(true)
@Insertable(false)
@JoinEntity 
Marks the current entity as a "Join Entity" (an entity referencing two other entities in order to manage a many-to-many relationship).
Scope : entity  /  Since :  4.1.0
@Label(string)
Defineabel(string)
Defines the label usable for the field (for example an HTML label).
Scope : attribute  /  Since : 3.2.0
@LinkByAttr(string [, string, ...]) 
Defines a link based on the given attribute(s) name(s) referencing the Primary Key.
For multiple attributes (in case of composite PK) each attribute must define the referenced attribute in the target entity.
Scope : link  /  Since : 3.3.0

Syntax : 
 // simple PK with a single attribute :
 @LinkByAttr(attributeName) 
 // composite PK with N columns (in PK order) :
 @LinkByAttr(attributeName1, attributeName2 [, attributeNameX ] )
Example : 
Point { 
   x : int { @Id @DbName(X) } ;  // PK 
   y : int { @Id @DbName(Y) } ;  // PK
   name : string ;
}
​
Line {
   id : int { @Id } ;
   color : string ;
	
   point1X : int  { @DbName(X1) } ;
   point1Y : int  { @DbName(Y1) } ;
	
   point2X : int  { @DbName(X2) } ;
   point2Y : int  { @DbName(Y2) } ;
​
   // LINKS 
   point1 : Point { @LinkByAttr(point1X , point1Y ) } ;
   point2 : Point { @LinkByAttr(point2X , point2Y ) } ;
}
@LinkByFK(string) 
Defines a link based on the given Foreign Key name.
Scope : link  /  Since : 3.3.0
Syntax : 
  @LinkByFK(foreignKeyName) 
Example :  
Area {
   id : int { @Id } ; 
   name : string ;
   // Foreign Key
   countryCode : string { @FK(FK_AREA_COUNTRY, Country) } ;
   // Link definition based on Foreign Key
   country : Country  { @LinkByFK(FK_AREA_COUNTRY) } ; 
}
@LinkByJoinEntity(string)
Defines a link based on the given "join entity" name.
Usable with "many to many" links to define a "join table".
Scope : link  /  Since : 3.3.0
Syntax : 
  @LinkByJoinEntity(entityName)
Example :  
Employee {
   id   : int { @Id } ; 
   name : string ;
   // EmployeeGroup is a "join entity" to associate employees and workgroups
   workgroups : Workgroup[] { @ManyToMany 
                @LinkByJoinEntity(EmployeeGroup) } ;
}
@LongText
Marks the attribute as "long text" (for example a text with several lines). 
This annotation can be used for HTML "text area" or database "CLOB".
Applicable with "string" basic type.
Scope : attribute  /  Since : 2.0.0
@ManyToMany 
Defines a "many to many" cardinality for a link.
Usable for ORM code generation (JPA, etc)
Scope : link  /  Since : 3.3.0
@MappedBy(attributeName)
Defines the "mappedBy" attribute for a link.
Usable for an "inverse side" relationship.
Scope : link  /  Since : 3.3.0
Example :
shops : Shop[] { @MappedBy(employee) } ;
@Max(decimal)
To set the maximum acceptable value.
Usable for field validation rules.
Applicable with "numeric" types.
Scope : attribute  /  Since : 2.0.0
@MaxLen(int)
To set the maximum acceptable length.
Usable for field validation rules and GUI fields definition.
Scope : attribute  /  Since : 4.0.0  (replaces "@SizeMax" )
@Min(decimal)
To set the minimum acceptable value.
Usable for field validation rules.
Applicable with "numeric" types.
Scope : attribute  /  Since : 2.0.0
@MinLen(int)
To set the minimum acceptable length.
Usable for field validation rules and GUI fields definition.
Scope : attribute  /  Since : 4.0.0  (replaces "@SizeMin" )
@NotBlank
The attribute value cannot be blank.
Usable for field validation rules.
Scope : attribute  /  Since : 2.0.0
@NotEmpty
The attribute value cannot be empty.
Usable for field validation rules.
Scope : attribute  /  Since : 2.0.0
@NotNull
The attribute value cannot be null.
Usable for field validation rules and SQL databases.
Scope : attribute  /  Since : 2.0.0
@ObjectType
The attribute type must be converted to "object/wrapper type" in the target language (for example for Java).
No effect if not supported by the target language.
Applicable with any basic type.
Scope : attribute  /  Since : 2.0.0
@OneToOne 
Defines a "one to one" cardinality for a link.
Usable for ORM code generation (JPA, etc)
Scope : link  /  Since : 3.3.0
@Optional
Defines an "optional" relationship for a link.
Usable for ORM code generation (JPA, etc)
Scope : link  /  Since : 3.3.0
@OrphanRemoval
Set 'orphanRemoval'  to true in ORM (JPA, etc)
Scope : link  /  Since : 4.1.0
@Package(string)
Defines the "package" to which the entity belongs
Scope : entity  /  Since : 4.0.0
@Past
The attribute value must be in the past (before current date).
Usable for field validation rules.
Applicable with "date" type.
Scope : attribute  /  Since : 2.0.0
@Pattern(string)
Defines a pattern usable for field validation, for example a "RegEx" pattern.
Scope : attribute  /  Since : 3.2.0
@PrimitiveType
The attribute type must be converted to "primitive type" in the target language (for example for Java).
No effect if not supported by the target language.
Applicable with any basic type.
Scope : attribute  /  Since : 2.0.0
@ReadOnly
Marks the entity as "readonly"
Scope : entity  /  Since : 4.0.0
@Size(size)
Defines the attribute size.
The size is defined with "precision" and "scale" if necessary (eg "6" or "6,2")
Scope : attribute  /  Since : 4.0.0
@SizeMax(int)
Deprecated - Do not use - Use "@MaxLen" instead
Defines the maximum acceptable size of the attribute value.
Scope : attribute  /  Since : 2.0.0
@SizeMin(int)
Deprecated - Do not use - Use "@MinLen" instead
Defines the minimum acceptable size of the attribute value.
Scope : attribute  /  Since : 2.0.0
@Transient
Define an attribute as "transient" (for example in a Java class or with an ORM like JPA)
Scope : attribute  /  Since : 3.3.0
@Unique
Marks the attribute as unique for the entity.
Scope : attribute  /  Since : 4.0.0  (experimental)
@UnsignedType
The attribute type must be converted to "unsigned type" in the target language (for example for C/C++).
No effect if not supported by the target language.
Applicable with any basic type.
Scope : attribute  /  Since : 3.0.0
@Updatable(boolean) 
Defines if the link is "updatable" or not.  
Scope : link  /  Since : 3.3.0
Examples : 
@Updatable(true)
@Updatable(false)
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Attribute / Link