下面是精华区的一个例子 cd.xml
<?xml version="1.0"?>
<database xmlns="http://www.newInstance.com/cd-database"
xmlns:sh="http://www.sugarhillrecords.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.newInstance.com/cd-database cd-database.xsd
http://www.sugarhillrecords.com sugarHill.xsd"
>
<cd title="Nickel Creek">
<artist>Nickel Creek</artist>
<sh:album>
<sh:description>Bluegrass Revivalists, Acoustic Innovators,
Youthgrass are just some of the terms that have been used
to describe Nickel Creek over the past year -- perhaps
producer Alison Krauss says it best:It's just Nickel Creek
music.</sh:description>
<sh:producer>Alison Krauss</sh:producer>
</sh:album>
</cd>
<cd title="Ice Caps: Peaks of Telluride">
<artist>Sam Bush</artist>
<sh:album>
<sh:description>Sam Bush's amazing mandolin and fiddle playing,
singing and outrageous stage presence have been captivating
audiences since the late 1960s. So what could be better-or
more fun-than a live Sam Bush album recorded at the Telluride
Bluegrass Festival, where he has performed for 26 years?
</sh:description>
<sh:producer>Sam Bush</sh:producer>
</sh:album>
</cd>
</database>
————————————————————————————————————
sugarHill.xsd
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ns1="http://www.sugarhillrecords.com" targetNamespace="http://www.sugarhillrecords.com" elementFormDefault="qualified">
<xs:element name="album">
<xs:complexType>
<xs:sequence>
<xs:element name="description" type="xs:string"/>
<xs:element name="producer" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
______________________________________________________________
cd-database.xsd 代码如下：
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:sh="http://www.sugarhillrecords.com" xmlns:ns1="http://www.newInstance.com/cd-database" targetNamespace="http://www.newInstance.com/cd-database" elementFormDefault="qualified">
<xs:import namespace="http://www.sugarhillrecords.com" schemaLocation="sugarHill.xsd"/>
<xs:element name="database">
<xs:complexType>
<xs:sequence>
<xs:element ref="cd" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="cd">
<xs:complexType>
<xs:sequence>
<xs:element name="artist" type="xs:string"/>
<xs:element ref="sh:albume"/>
</xs:sequence>
<xs:attribute name="title" type="xs:string"/>
</xs:complexType>
</xs:element>
</xs:schema>
当用xmlspy打开时，总出现以下错误提示：
'cd' must refer to an exsiting element
可是cd 不是已经定义了吗？
我是新手，请高手指点错误，谢谢！
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2006/7/13 10:03:00
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请教一个问题
