dmaClass_QueryOperandDescription

The Query Operand Description class is the metadata class that defines the signatures of operands used in a query expression. Note that this class does not inherit from the Metadata class, even though it is metadata.

Class ID: dmaClass_QueryOperandDescription
Superclass: DMA

Interfaces

Properties

Name	Impl. Required	System Gen'ed	Read-Only	Value Required	Type	Cardinality	Required Class
OIID	-	Yes	Yes	-	String	Scalar
Class Description	Yes	Yes	Yes	Yes	Object	Scalar	Class Description
This	-	Yes	Yes	Yes	Object	Scalar	Query Operand Description
Create Pending	-	Yes	Yes	Yes	Boolean	Scalar
Update Pending	-	Yes	Yes	Yes	Boolean	Scalar
Delete Pending	-	Yes	Yes	Yes	Boolean	Scalar
Operand Data Type	Yes	Yes	Yes	Yes	Integer32	Scalar
Allows Singleton	Yes	Yes	Yes	Yes	Boolean	Scalar
Allows List	Yes	Yes	Yes	Yes	Boolean	Scalar
Allows Constant	Yes	Yes	Yes	Yes	Boolean	Scalar
Allows Property	Yes	Yes	Yes	Yes	Boolean	Scalar
Allows Expression	Yes	Yes	Yes	Yes	Boolean	Scalar

Detailed Description

This class describes operands of operators. The data type of the operand is well known and is shown in the well known operator description, but the Boolean flag values are dependent on what the particular document space supports.

Property Descriptions

• OIID {dmaProp_OIID}
Property Inherited from DMA

• Class Description {dmaProp_ClassDescription}
Property Inherited from DMA

• This {dmaProp_This}
Property Inherited from DMA

• Create Pending {dmaProp_CreatePending}
Property Inherited from DMA

• Update Pending {dmaProp_UpdatePending}
Property Inherited from DMA

• Delete Pending {dmaProp_DeletePending}
Property Inherited from DMA

• Operand Data Type {dmaProp_OperandDataType}

The value of this property is the datatype of the operand.

The legal values for the datatypes of the operands of operators, and for the result of operators in query expressions are as follows.

Defined Datatypes

• Allows Singleton {dmaProp_AllowsSingleton}

This Boolean property indicates whether the operand can be a singleton.

• Allows List {dmaProp_AllowsList}

This Boolean property indicates whether the operand can be a list.

At least one of dmaProp_AllowsSingleton and dmaProp_AllowsList must be TRUE.

• Allows Constant {dmaProp_AllowsConstant}

This Boolean property indicates whether the operand can be a constant.

• Allows Property {dmaProp_AllowsProperty}

This Boolean property indicates whether the operand can be a property of a persistent object.

• Allows Expression {dmaProp_AllowsExpression}

This Boolean property indicates whether the operand can be the value of an expression.

At least one of dmaProp_AllowsConstant, dmaProp_AllowsProperty and dmaProp_AllowsExpression must be TRUE.