The use these elements:

• minInclusive - a minimum where the boundary value can be used.

• maxInclusive - a maximum where the boundary value can be used.

• minExclusive - a minimum where the boundary value can not be used.

• minExclusive - a minimum where the boundary value can not be used.

The maximum must always be bigger than the minimum.

The integers between 2 and 5:

<xs:simpleType name="score">
   <xs:restriction base="xs:integer">
      <xs:minInclusive value="2"/>
      <xs:maxInclusive value="5"/>
   </xs:restriction>
</xs:simpleType>