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Çë½ÌÒ»¸öÎÊÌâ ÏÂÃæÊǾ«»ªÇøµÄÒ»¸öÀý×Ó 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> ¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª¡ª 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  ´úÂëÈçÏ£º <?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> µ±ÓÃxmlspy´ò¿ªÊ±£¬×ܳöÏÖÒÔÏ´íÎóÌáʾ£º 'cd'¡¡must refer to an exsiting element ¿ÉÊÇcd ²»ÊÇÒѾ­¶¨ÒåÁËÂ𣿠ÎÒÊÇÐÂÊÖ£¬Çë¸ßÊÖÖ¸µã´íÎó£¬Ð»Ð»£¡    Êղؠ  ·ÖÏí   ¶¥(0)