XML Tutorial/XML Schema/unsignedLong
The unsignedLong data type is derived from the nonNegativeInteger type.
<source lang="xml">
The value space is the set of integers greater than or equal to 0 and less than or equal to 18446744073709551615. The lexical space is a finite-length sequence of decimal digits.
<xsd:simpleType name="distance_sun">
<xsd:restriction base="xsd:unsignedLong"> <xsd:pattern value="\d{8}"/> </xsd:restriction>
</xsd:simpleType>
<distance_sun>939000000</distance_sun></source>