first_.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="www.first.com">
<xs:simpleType name="bid">
<xs:restriction base="xs:string">
<xs:pattern value="[A]\d{6}"/>
</xs:restriction>
</xs:simpleType>
</xs:schema>
second_.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="www.second.com">
<xs:simpleType name="aid">
<xs:restriction base="xs:string">
<xs:pattern value="[c]\d{6}"/>
</xs:restriction>
</xs:simpleType>
</xs:schema>
_third.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns="www.myweb.com"
targetNamespace="www.myweb.com"
xmlns:first="www.first.com"
xmlns:second="www.second.com"> <xs:import namespace="www.first.com" schemaLocation="first_.xsd"/>
<xs:import namespace="www.second.com" schemaLocation="second_.xsd"/> <xs:element name="books" type="infotype"/> <xs:complexType name="infotype">
<xs:sequence>
<xs:element name="book" type="booktype"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="booktype">
<xs:sequence>
<xs:element name="title" type="xs:string"/>
<xs:element name="author" type="atype"/>
</xs:sequence>
<xs:attribute name="bookid" type="first:bid"/>
</xs:complexType>
<xs:complexType name="atype">
<xs:sequence>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
</xs:sequence>
<xs:attribute name="authorid" type="second:aid"/>
</xs:complexType>
</xs:schema>
说明:
first_.xsd:定义简单类型, 并指定目标命名空间为"www.first.com";
second_.xsd:定义简单类型, 并指定目标命名空间为"www.second.com";
third_.xsd:定义复杂类型,并引用first_.xsd, second_.xsd,引用这两个schema文件,但是目标命名空间不一致。因为third_.xsd引用了first_.xsd, second_.xsd所以必须指定这两个文件的命名空间为"www.first.com"和"www.second.com",否则无法引用firtst.xsd, second.xsd中定义的简单类型数据;
目标命名空间:指定被此Schema文档约束的元素及数据类型都来自于的命名空间;
默认命名空间:指定当前XML文档中使用的元素及数据类型都来自于的命名空间;