MatchesXsUnsignedByte🔗
          Check that 
        
        
      text conforms to the pattern of an xs:unsignedByte.
        Code
unsignedByteRep = (
    '(-0|\\+?0*[0-9]{1,3})'
)
pattern = (
    f'^{unsignedByteRep}$'
)
return match(
    pattern,
    text
) is not None