Data Typing in XML is Weak
<MONTH>9</MONTH>
<!DOCTYPE schema
PUBLIC '-//W3C//DTD XML Schema Version 1.0//EN'
SYSTEM 'http://www.w3.org/TR/1999/WD-xmlschema-1-19991217/structures.dtd' >
<schema targetNS="http://www.macfaq.com/examples/schema"
version="1.0"
xmlns="http://www.w3.org/1999/XMLSchema">
<datatype name="monthInt" source="integer"/>
<minInclusive value="1"/>
<maxInclusive value="12"/>
</datatype>
<element name="month" type="monthInt"/>
</schema>