XMLOptional

Define whether a variable can be omitted or not. It specifies how a NULL value is interpreted in XML if it is optional. For an option to set an XML node nillable when the BDL variable is NULL but not optional, see the XMLNillable attribute.
  1. The attribute cannot be set on a type definition.
  2. The attribute cannot be set if the main variable is not a RECORD.

Example

The variable "ValTwo" is optional when null.
DEFINE myVar RECORD ATTRIBUTES(XMLName="Root")
  val1 INTEGER ATTRIBUTES(XSDint,XMLName="ValOne"),
  val2 FLOAT ATTRIBUTES(XSDdouble,XMLName="ValTwo",XMLOptional)
END RECORD
In the resulting XML document, "ValTwo" is defined when not NULL. For example, if the output is viewed in an XML viewer, it would display as shown. 
<Root>
  <ValOne>458</ValOne>
  <ValTwo>58.48</ValTwo>
</Root>
In the resulting XML document, "ValTwo" is not defined when NULL. 
<Root>
  <ValOne>458</ValOne>
</Root>