<?xml version="1.0" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType name="dog">
    <xs:restriction base="myString">
      <xs:minLength value="5" />
      <xs:maxLength value="10" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="myString">
    <xs:restriction base="xs:string">

    </xs:restriction>
  </xs:simpleType>
</xs:schema>