<tag/> 之间是否存在语义差异?和<tag></tag>在 XML 中? [英] Is there a semantic difference between <tag /> and <tag></tag> in XML?
问题描述
我们与一位客户遇到了某种问题，该客户认为我们发送的 XML 文件中的两个版本的空标记之间存在语义差异(纯 XML 没有 HTML..).
We have some kind of problem with a customer which is arguing that there is a semantical difference between two versions of empty tag in an XML file we're sending (pure XML no HTML..).
他们期望:
<our-xml>
<some-tag></some-tag>
</our-xml>
我们发送:
<our-xml>
<some-tag />
</our-xml>
我们认为这完全相同，但我们无法真正用事实证明论点.我们发现的唯一内容是在 https://www.w3.org/TR/REC-xml/#sec-starttags 它说的地方
We are of the opinion that this is exactly the same but we could not really prove the arguments with facts. Only thing we found was in https://www.w3.org/TR/REC-xml/#sec-starttags where it says
空元素标签可用于任何没有内容的元素.
empty-element tags may be used for any element which has no content.
是否有任何讨论或更明确的论文可供我们参考，或者我们错了?
Is there any discussion or more clear paper that we can rely on or are we wrong?
推荐答案
否
Start-tag/End-tag (<tag></tag>) 和 Empty-element 标签 (
No
Start-tag/End-tag (<tag></tag>) and Empty-element tag (<tag/>) forms are semantically equivalent. No conforming XML parser will treat them differently.
空元素标签可用于任何没有内容的元素，无论是否使用关键字 EMPTY 声明.
Empty-element tags may be used for any element which has no content, whether or not it is declared using the keyword EMPTY.
历史注释:还有一个过时的 SGML 兼容性参考，我将其包括在内:
Historical note: There is also an antiquated SGML compatibility reference, which I include for completeness:
为了互操作性，应使用空元素标签，并且只能用于声明为 EMPTY 的元素.
For interoperability, the empty-element tag should be used, and should only be used, for elements which are declared EMPTY.
-
互操作性
[定义:标记一个描述非约束性建议的句子，以增加现有的 SGML 处理器可以处理 XML 文档的机会，这些处理器早于 ISO 8879 的 WebSGML 适配附件.]
[Definition: Marks a sentence describing a non-binding recommendation included to increase the chances that XML documents can be processed by the existing installed base of SGML processors which predate the WebSGML Adaptations Annex to ISO 8879.]
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