XML文档可以同时遵循DTD和XML Schema吗？ [英] Can an XML document follow both a DTD and an XML Schema?

问题描述

指定XML文档同时遵循DTD 和模式是否合法？
两者不会互相冲突吗？

Is it legal for an XML document to specify that it follows both a DTD and a Schema? Won't the two conflict with one another?

推荐答案

从技术上讲，我认为您在DTD上会遇到问题而不是识别用于引用架构的属性（名称空间声明和架构位置）。

Technically I think you would have problems with the DTD not recognizing the attributes for referencing the schema (the namespace declaration and the schema location).

但是，我认为这取决于您如何验证XML以及是否可以忽略DTD进行验证（如果指定了模式）。

However I think it depends on how you're validating your XML and whether or not you can ignore the DTD for validation if a schema is specified.

此外，对于您的分配，您确定必须同时引用相同的XML实例吗？也许您可以有2个版本的XML。

Also, for your assignment are you sure you have to reference both from the same XML instance? Maybe you could have 2 versions of the XML; one that references the DTD and one that references the schema?

这里还有另外两个可能的选择...

Here's two other possible options...

声明架构属性：

<!DOCTYPE doc [
<!ELEMENT doc (test)>
<!ATTLIST doc
          xmlns:xsi CDATA #IMPLIED
          xsi:noNamespaceSchemaLocation CDATA #IMPLIED>
<!ELEMENT test (#PCDATA)>
]>
<doc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="test.xsd">
    <test>Test Doc</test>
</doc>

使用处理指令来引用架构：

<!DOCTYPE doc [
<!ELEMENT doc (test)>
<!ELEMENT test (#PCDATA)>
]>
<?xml-model href="test.xsl"?>
<doc>
    <test>Test Doc</test>
</doc>

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