Service Studio 6.0 Help
Entity Identifier Data Type
For each Entity that has an attribute that is its Identifier (Attribute that uniquely identifies an entity row. Each entity should have an Identifier.), a new data type is created. These data types are used to implement relationships between the entities that you have in your eSpace.
Since the possible types of an Identifier are Integer and Text, the default values are, respectively, the values returned by the NullIdentifier and NullTextIdentifier built-in functions.
Built-in Entity Identifier built-in functions | About Entity Identifier Literal | About null values | Available Data Types