/xsd 文档
<?xml version="1.0" encoding="utf-8"?><xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="userInput"> <xs:complexType> <xs:sequence> <xs:element name="name" type="xs:string" /> <xs:element name="author" type="xs:string" /> <xs:element name="publisher" type="xs:string" /> <xs:element name="pubDate" type="xs:date" nillable="true" /> <xs:element name="price" type="xs:decimal" nillable="true" /> </xs:sequence> </xs:complexType> </xs:element></xs:schema>xml文件<userInput xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <name></name> <author>bb</author> <publisher>cc</publisher> <pubDate>2001-01-01</pubDate> <price xsi:nil="true"></price></userInput>//1.如果没有 xsi:nil="true",空值验证通不过2.如果没有 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 提示 xsi 是未声明的 命名空间3.如果设定了xsi:nil="true"后,有值,会提示 "price"必须没有任何字符或元素子级4.参考文档 XML解析之xsi:nil="true" http://blog.csdn.net/amachaoiv/archive/2008/01/22/2059382.aspx5.http://www.ibm.com/developerworks/cn/webservices/ws-tip-null.html
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