how to define min and max number of characters for a complexType?

[175518]

i have my complexType element .have no idea how to set min and max number of characters allowed to use for element "author".

here is my complexType element from schema

<xsd:element name="author">
 <xsd:complexType>
	         <xsd:simpleContent>
              <xsd:extension base="xsd:string">
               <xsd:attribute type="xsd:string" name="gender" use="required"/>
			  </xsd:extension>
             </xsd:simpleContent>
            </xsd:complexType>
           </xsd:element>

for simpleType i already made this

<xsd:element name="original_title">
		    <xsd:simpleType>
             <xsd:restriction base="xsd:string">
              <xsd:minLength value="3"/>
              <xsd:maxLength value="22"/>
             </xsd:restriction>
            </xsd:simpleType>
           </xsd:element>

[Luuk]

(source: http://www.w3schools.com/schema/schema_facets.asp)

This example defines another element called "password" with a restriction. The value must be minimum five characters and maximum eight characters:

 <xs:element name="password">
  <xs:simpleType>
     <xs:restriction base="xs:string">
       <xs:minLength value="5"/>
       <xs:maxLength value="8"/>
     </xs:restriction>
   </xs:simpleType>
</xs:element>