Many commonly required data types are pre-defined in the 'type library' provided with the standard, ftp://www.w3.org/2001/03/XMLSchema/TypeLibrary.xsd. This library includes such types as:
text (TypeLibrary-text.xsd)
arrays (TypeLibrary-array.xsd)
lists (TypeLibrary-list.xsd)
mathematics (TypeLibrary-math.xsd)
quantity test (TypeLibrary-quantity.xsd).
3.15.156.140