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ISUNKNOWN

This function replaces a value if that value is unknown.

Syntax

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ISNULL


This function checks whether a value is unknown. 


Syntax

Code Block
ISNULL ( expression )



Input
  • expression - Expression that is checked.


Return type

  • boolean - TRUE of the attribute is unknown, FALSE otherwise


Examples

Suppose the following data model.


Person.namePerson.SequenceNumber
“Bob”654
“Jane”?
Active PersonExpressionResultType
BobISNULL ( Person.SequenceNumber )FALSEBoolean
JaneISNULL ( Person.SequenceNumber )TRUEBoolean


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Code Block
ISUNKNOWN ( expression , value )
Inputs
  • expression- Expression of which the value has to be returned if that value is known.
  • value - Value to return if the expression value is unknown.

Return type

  • any type, equals the expression type

Examples

Suppose the following data model.

Person.namePerson.SequenceNumber“Bob”654“Jane”?“Mary”667“Rick”?“Ron”?“Jenny”765?111Active PersonExpressionResultTypeJane - ?ISUNKNOWN ( Person.SequenceNumber , 999 )999IntegerMary - 667ISUNKNOWN ( Person.SequenceNumber , 999 )667Integer? - 111ISUNKNOWN ( Person.Name , "customer" )"customer"String
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Both parameters of the ISUNKNOWN function must be of the same datatype. If they differ in datatype, you get this validation error in studio:

Could not find function: ISUNKNOWN matching arguments System.Collections.ArrayList

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IFUNKNOWN

An alternative notation of the ISUNKOWN function, which increases readability especially for long expressions. This function replaces a value if that value is unknown.

The IFUNKNOWN function takes precedence over any other binary operator (except for the "NOT" operator). For example, this means that the expression A.B AND C.D IFUNKNOWN FALSE will be interpreted as A.B AND (C.D IFUNKNOWN FALSE). You can use parentheses to influence this behavior, e.g. by writing (A.B AND C.D) IFUNKNOWN FALSE. For the "NOT" operator the following expression "X AND NOT B IFUNKNOWN FALSE", can also be read as "X AND ((NOT B) IFUNKNOWN FALSE)"

Syntax

Code Block
expression IFUNKNOWN value

Inputs

  • expression- Expression of which the value has to be returned if that value is known.

  • value - Value to return if the expression value is unknown.

Return type

  • any type, equals the expression type

Examples

Suppose the following data model.

Person.namePerson.SequenceNumberPerson.HasDrivingLicense“Bob”654true“Jane”?true“Mary”667false“Rick”??“Ron”?false“Jenny”765true?111trueActive PersonExpressionResultTypeJane - ? - truePerson.SequenceNumber IFUNKNOWN 999 999IntegerMary - 667 - falsePerson.SequenceNumber IFUNKNOWN 999667Integer? - 111 - truePerson.Name IFUNKNOWN "customer""customer"String"Rick" - ? - ?NOT Person.HasDrivingLicense IFUNKOWN falsefalseBoolean
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Both parameters of the IFUNKNOWN function must be of the same datatype. If they differ in datatype, you get this validation error in studio:

Could not find function: IFUNKNOWN matching arguments System.Collections.ArrayList

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IS A

Use this function to check the type of an instance. The function returns TRUE if the selected instance is of the specified entity. 

Syntax

Code Block
instance IS A entity_name
Inputs
  • instance - Instance to check.
  • entity_name - Name of the entity as string.

Return type

  • Boolean

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.

If you want to determine the number of bedrooms is the residence:

  • COUNT ( COLLECT Room FROM Residence.hasRooms WHERE ( Room IS A “Bedroom” ) )

If you want to determine the number of bathrooms is the residence:

  • COUNT ( COLLECT Room FROM Residence.hasRooms WHERE ( Room IS A “Bathroom” ) )

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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

Code Block
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 Kitchen instance the expression ( TYPE OF Room ) = “Kitchen”
  • for the Bedroom instances the expression ( TYPE OF Room ) = “Bedroom”

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ISACTIVE

Use this function to determine if an instance of a specific type is currently active.

Code Block
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

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Singletons are always active, so ISACTIVE <singleton> will always return TRUE 

Examples

Suppose the following data model.

...

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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

Code Block
GUID()

Return type

  • String - the generated GUID

Examples

...

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