XML Tutorial/XML Schema/negativeInteger
The negativeInteger data type is derived from the nonPositiveInteger type.
<source lang="xml">
The value space is the infinite set of integer values less than or equal to ? The lexical space is a finite-length sequence of decimal digits preceded by a -.
<xsd:simpleType name="myType">
<xsd:restriction base="xsd:negativeInteger"> <xsd:pattern value="-\d{2}"/> </xsd:restriction>
</xsd:simpleType>
<myType>-49</myType></source>