XYArrayItemType represents a vector of XVType values like a list of peaks, where XVType.x is the position of the peak and XVType.value is its intensity. XYArrayItemType is formally defined in Table 13.

Table 13 – XYArrayItemType definition

Attribute

Value

BrowseName

XYArrayItemType

IsAbstract

False

ValueRank

1

DataType

XVType

References

NodeClass

BrowseName

DataType

TypeDefinition

ModellingRule

Subtype of the ArrayItemType defined in 5.3.4.1

HasProperty

Variable

XAxisDefinition

AxisInformation

PropertyType

Mandatory

Conformance Units

Data Access XYArrayItemType

The Value of the XYArrayItem contains an array of structures (XVType) where each structure specifies the position for the X-Axis (XVType.x) and the value itself (XVType.value), used for the Y-Axis. Engineering units and range for the Value are defined by corresponding Properties inherited from the ArrayItemType.

XAxisDefinition Property holds the information about the Engineering Units and Range for the X-Axis.

The axisSteps of XAxisDefinition shall be set to NULL because it is not used.

The StatusCode SemanticsChanged bit shall be set if any of the InstrumentRange, EURange, EngineeringUnits, Title or XAxisDefinition Properties are changed (see 5.2 for additional information).