The nonNegativeInt type defines an integer value greater than or equal to zero.
Example:
<expirationTimeSpanInSeconds>900</expirationTimeSpanInSeconds>
XML Schema:
<s:simpleType name="nonNegativeInt">
<s:restriction base="s:int">
<s:minInclusive value="0"/>
</s:restriction>
</s:simpleType>