XML Tutorial/XML Schema/nonPositiveInteger

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The nonPositiveInteger datatype is derived from the integer type

The value space is the infinite set of integers less than and including zero. 
The lexical space is a finite-length sequence of decimal digits preceded by a -.
<!-- schema -->
<xsd:simpleType name="BC">
  <xsd:restriction base="xsd:nonPositiveInteger">
   <xsd:minInclusive value="unbounded"/>
   <xsd:maxInclusive value="-2001"/>
<!-- instance document -->