XML Schema - Schema definition reuse

Direct:

<xs:include schemaLocation="character.xsd"/>

With redefinition:

<xs:redefine schemaLocation="character12.xsd">
 <xs:simpleType name="nameType"> 
  <xs:restriction base="xs:string"> 
   <xs:maxLength value="40"/>
  </xs:restriction> 
 </xs:simpleType>
</xs:redefine>