我在一个XML文档bookinfor.xml中引用了一个bookinfor.xsd的schema,schema中使用了key、keyref等来定义关键字，xml文档中的bookid有重复，在xml spy中验证为什么通过了呢？
bookinfor.xsd
<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSpy v2005 rel. 3 U (http://www.altova.com) by () -->
<!-- edited with XML Spy 2005 by Eric HONG Oct 29 2005 -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="BookInfor">
<xs:annotation>
<xs:documentation>The information of a book</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element ref="BookItem" maxOccurs="unbounded"/>
<xs:element ref="BookSort" maxOccurs="unbounded"/>
<xs:element ref="BookQuantity" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="BookItem">
<xs:annotation>
<xs:documentation>Basic infor of a book</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="BookId" type="xs:positiveInteger"/>
<xs:element name="Nane" type="xs:string"/>
<xs:element name="Sort" type="xs:positiveInteger"/>
<xs:element name="Isbn" type="xs:string"/>
<xs:element name="PubDate" type="xs:gYearMonth"/>
<xs:element name="Author" type="xs:string"/>
<xs:element name="Price">
<xs:simpleType>
<xs:restriction base="xs:decimal">
<xs:fractionDigits value="2"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:key name="BookItem_BookId">
<xs:selector xpath="BookItem"/>
<xs:field xpath="@BookId"/>
</xs:key>
<xs:keyref name="BookItem_Sort" refer="BookSort_SortId">
<xs:selector xpath="BookSort"/>
<xs:field xpath="@Sort"/>
</xs:keyref>
<xs:unique name="BookItem_Id">
<xs:selector xpath="BookItem"/>
<xs:field xpath="@BookId"/>
</xs:unique>
</xs:element>
<xs:element name="BookSort">
<xs:annotation>
<xs:documentation>sort of a book</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="SortId" type="xs:positiveInteger"/>
<xs:element name="Name" type="xs:string"/>
<xs:element name="Code" type="xs:string"/>
<xs:element name="Remark" type="xs:string"/>
</xs:sequence>
</xs:complexType>
<xs:key name="BookSort_SortId">
<xs:selector xpath="BookSort"/>
<xs:field xpath="@SortId"/>
</xs:key>
</xs:element>
<xs:element name="BookQuantity">
<xs:annotation>
<xs:documentation>Quantity of a sort of book</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="PriKey" type="xs:positiveInteger"/>
<xs:element name="BookId" type="xs:positiveInteger"/>
<xs:element name="Quantity">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="0"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="RecDate" type="xs:date"/>
</xs:sequence>
</xs:complexType>
<xs:keyref name="BookQuantity_BookId" refer="BookItem_BookId">
<xs:selector xpath="BookItem"/>
<xs:field xpath="@BookId"/>
</xs:keyref>
<xs:key name="BookQuantity_PriKey">
<xs:selector xpath="BookQuantity"/>
<xs:field xpath="@PriKey"/>
</xs:key>
</xs:element>
</xs:schema>
bookinfor.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSpy v2005 rel. 3 U (http://www.altova.com) by () -->
<BookInfor xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:noNamespaceSchemaLocation="C:\Documents and Settings\hy\桌面\spy\BookInfor.xsd">
<BookItem>
<BookId>1</BookId>
<Nane>Java与XML数据库整合应用</Nane>
<Sort>1</Sort>
<Isbn>7-900637-51-6</Isbn>
<PubDate>2002-01</PubDate>
<Author>沈兆阳</Author>
<Price>49.00</Price>
</BookItem>
<BookItem>
<BookId>2</BookId>
<Nane>XML Schema数据库编程指南</Nane>
<Sort>1</Sort>
<Isbn>7-5053-7674-8</Isbn>
<PubDate>2002-05</PubDate>
<Author>Chelsea Valentine</Author>
<Price>48.00</Price>
</BookItem>
<BookItem>
<BookId>2</BookId>
<Nane>离散数学</Nane>
<Sort>2</Sort>
<Isbn>7-80513-069-8/O.04</Isbn>
<PubDate>2005-01</PubDate>
<Author>左孝凌</Author>
<Price>16.00</Price>
</BookItem>
<BookItem>
<BookId>4</BookId>
<Nane>At Middle Age</Nane>
<Sort>3</Sort>
<Isbn>0-8351-1609-3</Isbn>
<PubDate>1987-12</PubDate>
<Author>Shen Rong</Author>
<Price>35.00</Price>
</BookItem>
<BookSort>
<SortId>1</SortId>
<Name>XML相关</Name>
<Code>TN-05-829</Code>
<Remark>计算机-语言-学习</Remark>
</BookSort>
<BookSort>
<SortId>2</SortId>
<Name>数学教材</Name>
<Code>JY-01-021</Code>
<Remark>数学教材</Remark>
</BookSort>
<BookSort>
<SortId>2</SortId>
<Name>英文小说</Name>
<Code>AD-02-03</Code>
<Remark>英文小说</Remark>
</BookSort>
<BookQuantity>
<PriKey>1</PriKey>
<BookId>1</BookId>
<Quantity>3</Quantity>
<RecDate>2005-10-28</RecDate>
</BookQuantity>
<BookQuantity>
<PriKey>2</PriKey>
<BookId>2</BookId>
<Quantity>6</Quantity>
<RecDate>2005-10-28</RecDate>
</BookQuantity>
<BookQuantity>
<PriKey>3</PriKey>
<BookId>3</BookId>
<Quantity>29</Quantity>
<RecDate>2005-10-28</RecDate>
</BookQuantity>
<BookQuantity>
<PriKey>4</PriKey>
<BookId>4</BookId>
<Quantity>6</Quantity>
<RecDate>2005-10-28</RecDate>
</BookQuantity>
</BookInfor>
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2005/11/6 12:52:00
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schema中key、keyref怎么确定唯一性约束啊？
