negativeInteger data type
The xs:negativeInteger data type represents an integer that is less than zero. Derived from data type xs:nonPositiveInteger.
The lexical form of xs:negativeInteger is negative sign
(-) that is followed by a finite-length sequence of decimal digits.
The range that can be represented by this data type is from -9223372036854775808
to -1. The following numbers are valid examples of this data type: -1,
-12678967543233, and -100000.