I'm sorry... here is the schema again...

?xml version="1.0" encoding="utf-8" ?
schema xmlns="http://www.w3.org/2001/XMLSchema"
element name="Root"
complexType
sequence
element name="Distribution" maxOccurs="unbounded"
complexType
sequence
element name="town" type="positiveInteger" /
element name="species" type="positiveInteger" /
/sequence
/complexType
/element
/sequence
/complexType
/element
/schema