Question

我正试图撰写一份DTD文件,我想界定一个PBOOKTYPE的内容,这个要素可以是:ONE、TWO或THREE。我是否可以确保这些价值中只有一种能够输入要素?

Note: 1. I know how to do this in an attribute, but not sure how to accomplish with elements. 2. I want a way of doing this INSIDE the DTD, not using a programming language.

Answer 1

Not in DTD, sorry. 你们只能具体指明

你们必须把数据移至一个属性,或者使用比老的和低的DVD更强大的化体语言。

Answer 2

Is there a way I can ensure that only one of these values can be entered inside the element?

是的,含有 XML Evidation 。这里的一个例子是货币:

<xsd:simpleType name = "iso3currency">
 <xsd:restriction base = "xsd:string">
  <xsd:enumeration value = "AUD"/><!-- Australian Dollar -->
  <xsd:enumeration value = "BRL"/><!-- Brazilian Real -->
  <xsd:enumeration value = "CAD"/><!-- Canadian Dollar -->
  <xsd:enumeration value = "CNY"/><!-- Chinese Yen -->
  <xsd:enumeration value = "EUR"/><!-- Euro -->
  <xsd:enumeration value = "GBP"/><!-- British Pound -->
  <xsd:enumeration value = "INR"/><!-- Indian Rupee -->
  <xsd:enumeration value = "JPY"/><!-- Japanese Yen -->
  <xsd:enumeration value = "RUR"/><!-- Russian Rouble -->
  <xsd:enumeration value = "USD"/><!-- US Dollar -->
  <xsd:length value = "3"/>
 </xsd:restriction>

这把该要素的价值限制在列出的计算值之一和3年的长度。

为此,您必须通过 validator 。这方面的一个例子。该网络在此:

HOW TO: Validate XML Fragments Against an XML Schema in Visual C#.NET http://support.microsoft.com/kb/318504

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