If A is true then also B must be present" with Constraints - XPath 1 Required [attribute], Single Occurrence, with Simple Type [inline-ExampleIfAThenAlsoBOtherwiseNoB-A] localName is [A] without namespace Optional [attribute], Single Occurrence, with Simple Type [inline-ExampleIfAThenAlsoBOtherwiseNoB-B] localName is [B] without namespace If A is true then also B must be present" with Constraints - XPath 1