Sum must be 100 - Optional Fields - XPath2 Functions Variation - Instance constraint example from Eleusoft Application Documentation Optional [attribute], Single Occurrence, with Simple Type [inline-Form-A] localName is [A] without namespace Optional [attribute], Single Occurrence, with Simple Type [inline-Form-B] localName is [B] without namespace Sum must be 100 - Optional Fields - XPath2 Functions Variation - Instance constraint example from Eleusoft Application Documentation