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TYPE OF
Use this function to determine the type of an instance. The function returns the name of the entity.
Syntax
TYPE OF base_entity
Input
- base_entity - Name of the instance's base entity.
Return type
- string
Examples
Suppose a domain model in which there is a singleton entity Residence that has a multivalued relation hasRooms with Room. Room is the base entity for singleton Kitchen and not singletons Bedroom and Bathroom.
- for the
Kitcheninstance the expression( TYPE OF Room ) = “Kitchen” - for the
Bedroominstances the expression( TYPE OF Room ) = “Bedroom”
ISACTIVE
Use this function to determine if an instance of a specific type is currently active.
ISACTIVE instances [WHERE condition]
Inputs
- instances - instances to search
- condition - optional condition to limit the collection of instances to check
Return type
Boolean - TRUE if one of the instances is active, FALSE otherwise
Singletons are always active, so
ISACTIVE<singleton> will always returnTRUE
Examples
Suppose the following data model.
| instance_id | Person.name | Person.Age |
|---|---|---|
| Person_1 | “Bob” | 14 |
| Person_2 | “Jane” | 25 |
| Person_3 | “Mary” | 30 |
| Active Person | Expression | Result | Type | Note |
|---|---|---|---|---|
| None | ISACTIVE Person | FALSE | Boolean | |
| Person_1 | ISACTIVE Person | TRUE | Boolean | |
| Person_1 | ISACTIVE Person WHERE Person.Age >= 18 | FALSE | Boolean | |
| None | ISACTIVE system | TRUE | Boolean | |
| None | Person.Age >= 18 | Error | No Person is active | |
| None | ( ISACTIVE Person ) AND Person.Age >= 18 | FALSE | Boolean | The expression is evaluated left-to-right and fails on ( ISACTIVE Person ) instead of giving an error |
GUID
This function is able to generate a globally unique identifier which can later be used to uniquely mark and recognize a desired element. The GUIDs are represented as 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters.
Syntax
GUID()
Return type
String - the generated GUID
Examples
| Expression | Result |
|---|---|
| GUID() | 4a18d6a7-03c1-47f9-b6aa-eae7d746050e |
| GUID() | 91d37298-23ec-4bd4-8523-9c7e7745cb9d |
Overview
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