MatchesXsYearMonthDuration🔗
          Check that 
        
        
      text conforms to the pattern of an xs:yearMonthDuration.
        Code
yearMonthDurationRep = (
    '-?P((([0-9]+Y)([0-9]+M)?)|([0-9]+M))'
)
pattern = (
    f'^{yearMonthDurationRep}$'
)
return match(
    pattern,
    text
) is not None