import and targetnamspace

["learning xml" <learning_xml@hotmail.com>]

Hi, everyone:
I made to schemas--reserved.xsd and book.xsd. I hope to combine
them together and I try to import reserved.xsd to book.xsd.
I put the reserved.xsd at the location:
http://www.hut.fi/~wezm.
--------------------------------------------------------------------------
But the errors message occured:
reserved.xsd:2:56: src-import.3.1: The namespace attribute 
'http://www.hut.fi/~wezm' of an <import> element information item must be 
identical to the targetNamespace attribute 'null' of the imported document.
[Error] book.xsd:68:57: src-resolve.4: Components from namespace 
'http://www.hut.fi/~wezm/' are not referenceable from schema document 
'file:///tmp/example/xml_1/book.xsd'.
---------------------------------------------------------------------------
book.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:rv="http://www.hut.fi/~wzhou";
targetNamespace="http://www.w3.org/2001/XMLSchem";
elementFormDefault="unqualified"
attributeFormDefault="unqualified">
<xs:import namespace="http://www.hut.fi/~wzhou";
   schemaLocation="reserved.xsd"/>

<!-- definition of simple types -->
  <xs:simpleType name="nameType">
    <xs:restriction base="xs:string">
      <xs:maxLength value="64"/>
    </xs:restriction>
  </xs:simpleType>

<xs:simpleType name="sinceType">
    <xs:restriction base="xs:date"/>
  </xs:simpleType>

  <xs:simpleType name="descType">
    <xs:restriction base="xs:string"/>
  </xs:simpleType>

<xs:simpleType name="isbnType">
    <xs:restriction base="xs:string">
      <xs:pattern value="[0-9]{10}"/>
    </xs:restriction>
  </xs:simpleType>

<!-- definition of group-->
<xs:group name="mainBookElement">
<xs:sequence>
<xs:element name="title" type="nameType"/>
<xs:element name="author" type="nameType"/>
</xs:sequence>
</xs:group>

<!-- definition of complex type library -->
  <xs:complexType name="library">
    <xs:sequence>
   <xs:element name="name" type="nameType"/>
   <xs:element name="address" type="nameType"/>
   <xs:element name="books" type="books" minOccurs="1" 
maxOccurs="unbounded"/>
   </xs:sequence>
  </xs:complexType>

<!-- definition of complex type books -->
  <xs:complexType name="books">
    <xs:sequence>
    <xs:element name="book" type="bookType" minOccurs="1" 
maxOccurs="unbounded"/>
    </xs:sequence>
  <xs:attribute name="number" type="xs:int" use="required"/>
</xs:complexType>

<!-- definition of complex types -->
  <xs:complexType name="characterType">
    <xs:sequence>
      <xs:element name="publicationDate" type="sinceType"/>
      <xs:element name="description" type="descType"/>
    </xs:sequence>
  </xs:complexType>

<xs:complexType name="bookType">
<xs:sequence>
     <xs:group ref="mainBookElement"/>
      <xs:element name="character" type="characterType" minOccurs="1" 
maxOccurs="unbounded"/>
      	<!-- the definition of the "character" element is using the 
"characterType" complex type -->
------------------------------------------------------------------------
|  <xs:element name="customer" type="rv:customerType"/>     |
------------------------------------------------------------------------
	</xs:sequence>
    <xs:attribute name="isbn" type="isbnType" use="required"/>
    </xs:complexType>

<xs:element name="library" type="library">

<xs:unique name="bookNumber">
<xs:selector xpath="bookType"/>
<xs:field xpath="@isbn"/>
</xs:unique>

<!--define a key construct-->
<xs:key name="charName">
<xs:selector xpath="bookType/mainBookElement"/>
<xs:field xpath="name"/>
</xs:key>

<!--define a keyref construct-->
<xs:keyref name="charNameRef" refer ="charName">
<xs:selector xpath="bookType"/>
<xs:field xpath="@isbn"/>
</xs:keyref>
</xs:element>
</xs:schema>
-----------------------------------------------------------------------
reserved.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>

<!-- definition of simple types -->
  <xs:simpleType name="nameType">
    <xs:restriction base="xs:string">
      <xs:maxLength value="32"/>
    </xs:restriction>
  </xs:simpleType>

<xs:simpleType name="cardType">
    <xs:restriction base="xs:string">
      <xs:pattern value="[0-9]{10}"/>
    </xs:restriction>
  </xs:simpleType>

<xs:simpleType name="DateType">
    <xs:restriction base="xs:date"/>
  </xs:simpleType>

<xs:complexType name="customerType">
    <xs:sequence>
      <xs:element name="title" type="nameType"/>
      <xs:element name="cardNo." type="cardType"/>
     <xs:element name="dueTime" type="dateType"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

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