FilterElement QML Type
The OPC UA ContentFilterElement. More...
Import Statement: | import QtOpcUa . |
Since: | QtOpcUa 5.13 |
Properties
- firstOperand : variant
- operatorType : FilterElement::FilterOperator
- secondOperand : variant
Detailed Description
A content filter element contains an operator and operands. There are four different operator types which contain literal values, references to attributes of nodes or to other content filter elements.
A combination of one or more content filter elements makes a content filter which is used by the server to filter data for the criteria defined by the content filter elements. For example, the where
clause of an event filter is a content filter which is used to decide if a notification is generated for an event.
QtOpcUa.FilterElement { operator: QtOpcUa.FilterElement.GreaterThanOrEqual firstOperand: QtOpcUa.SimpleAttributeOperand { ... } secondOperand: QtOpcUa.LiteralOperand { ... } }
See also EventFilter.
Property Documentation
First operand to be used with the operator. This can be one of SimplateAttributeOperand, AttributeOperand, LiteralOperal or ElementOperand.
Second operand to be used with the operator. This can be one of SimplateAttributeOperand, AttributeOperand, LiteralOperal or ElementOperand.