问题描述
我试图在 <!doctype/> 声明中定义 non-breakspace entity.代码:
I am trying to define non breaking space entity in the <!doctype /> declaration. Code :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [ <!ENTITY nbsp " "> ] />
<html xmlns="http://www.w3.org/1999/xhtml">
.. ....
但是当我从上面的文档创建一个 XDocument 对象时，我得到一个异常
But still when i am creating an XDocument object from the above document, i am getting an exception
Undefined entity  .
我做错了什么?
推荐答案
首先，中外部和内部实体的结合"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [ <!ENTITY nbsp " ">] 是不必要的，因为 http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd 包括 www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent 其中包括 <!ENTITY nbsp " "> 与您的完全相同.
Firstly, the combination of external and internal entities in "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [ <!ENTITY nbsp " "> ] is unnecessary because http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd includes www.w3.org/TR/xhtml1/DTD/xhtml-lat1.ent which includes <!ENTITY nbsp " "> which is exactly the same as yours.
所以那一点应该是:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
其次，XDocument 默认不验证 DTD.但是，您可以使用适当的设置从 XmlValidatingReader 或 XmlTextReader 中Load
Secondly, XDocument doesn't validate to a DTD by default. However, you can Load from an XmlValidatingReader or XmlTextReader with the appropriate settings
[如果不可能，让它成为可能！]最好将 XmlReader 设置为使用 XmlPreloadedResolver，因为有很多人在那个 DTD 的 URI 和它包含的 .ent 文件上击中可怜的 W3C，他们完全可以使用它的本地副本(完全可以"我的意思是，如果每个人都愿意，他们会非常高兴停止敲打他们的服务器).除了对他们有好处，对你来说也会更快.
[If it's not possible, make it possible!] it's a good idea to set the XmlReader to use a XmlPreloadedResolver, because there's a lot of people hitting poor ol' W3C at the URI of that DTD and the .ent files it includes, and they're totally okay with you using a local copy of it (by "totally okay" I mean they'd be really glad if everyone would stop hammering their server quite so much). As well as being good for them, it'll be much faster for you.
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