Entity

Entity file

Each entity is defined in a text file editable with any editor. The file name is composed of the name of the entity followed by the extension ".entity".

Examples :

Car.entity
Driver.entity

Entity name

The entity name can be composed of : letters, numbers and "_" (underscore). Other characters are not allowed. By convention the name usually starts with an upper case character. The entity name must be the same as the file name, for example if the file is "Car.entity" then the entity name must be "Car".

Examples of valid entity names :

• Car

• Car123

• CarOwner

• Car_owner

Examples of invalid entity names :

• Car#12 ( "#" not allowed )

• Car+Owner ( "+" not allowed )

Comments

Comments can be placed anywhere in the file. A comment starts with "//". All the end of line located after "//" is the comment. Comments are only "single line" (no multi lines comments).

Example :

xxx  // the comment

Entity structure

The entity structure is made up of the name of the entity followed by a block containing all of its attributes and links. The block containing the attributes and the links starts with '{' and ends with '}'. "End Of Line" characters are not significant. They are used only for readability. Potentially all the entity can be described in a single line.

Example :

EntityName {
   // attributes 
   id   : int { @Id } ; // attribute 'id'
   name : string  ; // attribute 'name'
   // links
   town : Town ; // link to the 'Town' entity
}