XSD validation using Schematron

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Hi,

I'm trying to add schematron validation to my xsd.
This is my new xsd :

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    xmlns:sch="http://www.ascc.net/xml/schematron"    
    elementFormDefault="qualified" &gt;
 <xs:element name="books"> 
  <xs:complextype>
   <xs:sequence>   ;P 
    <xs:element name="book" type="bookType" maxoccurs="unbounded">
      <xs:annotation>
       <xs:appinfo>
        <sch:pattern id="onLoanTests" xmlns:sch="http://purl.oclc.org/dsdl/schematron">
          <sch:rule context="book">
           <sch:report test="@on-loan and not(@return-date)">
           Every book that is on loan must have a return date
           </sch:report>
          </sch:rule>
        </sch:pattern>
       </xs:appinfo>
      </xs:annotation>
    </xs:element>
   </xs:sequence> 
  </xs:complextype>
 </xs:element>
 <xs:complextype name="bookType">
  <xs:sequence>
   <xs:element name="title" type="xs:string" />
   <xs:element name="author" type="xs:string" />
   <xs:element name="publication-date" type="xs:string" />
  </xs:sequence>
  <xs:attribute name="publisher" type="xs:string" use="required" />
  <xs:attribute name="on-loan" type="xs:string" use="required" />
  <xs:attribute name="return-date" type="xs:string" use="optional" />
 </xs:complextype>
</xs:schema>

This is my test xml:

<books>
<book publisher="ddd" on-loan="sdsd">
  <title>idan title</title> 
  <author>idan author</author> 
  <publication-date>idan date</publication-date> 
</book>
</books>

Using the xml I provided I don't get validation error.
I assumed I will get the message "Every book that is on loan must have a return date" And that the xml won't be valid. Suggestions as to why ?