[basex-talk] Is op:divide-dayTimeDuration function implemented?

Hi I am trying to use function op:divide-dayTimeDuration as declared at http://www.w3.org/TR/xquery-operators/#func-divide-dayTimeDuration <http://www.w3.org/TR/xquery-operators/#func-divide-dayTimeDuration>BaseX tells me either unknown namespace op, or unknown function. Is this supported by BaseX, or I shall find my own implementation written in XQuery? Jan