For example, an XML document can point to an external DTD.
例如，XML文档可能指向一个外部DTD。
XM now has an option to ignore the external DTD of a document.
现在，XM可以选择忽略文档的外部DTD。
XML bugs: the site where the external DTD is hosted can log the communication.
XMLbug：外部DTD所驻留的站点会记录该通信。
If the schema location or the external DTD cannot be accessed, the parser issues an error message.
如果访问不了模式位置或外部DTD，解析器就会发出错误消息。
Entity resolution (including the reading of the external DTD subset) opens a number of potential security holes in XML.
实体解析(包括读取外部dtd子集)打开了XML中的一些潜在安全漏洞。
If you have enabled validation, the value of this feature is ignored, in which case external DTD subsets are always read.
如果启用验证，该特性的值将被忽略，这种情况下总是会读入外部dtd子集。
Another hoped-for core improvement that didn't make it is the ability for the user to request that the browser loads the external DTD subset.
未能实现的另一个期望的核心改进是允许用户请求浏览器装入外部dtd子集。
As we discussed, according to the XML specification a validating processor (such as Xerces2) must process both the internal and external DTD subsets.
我们曾经说过，根据XML规范，验证处理程序(如xerces2)必须处理外部和内部dtd子集。
Use parameter entities to pull external declarations into your DTD, or to create in-DTD macros to improve readability.
参数实体用于将外部声明拖到DTD 中，或者用于创建DTD 内部宏来改善可读性。
The process of validation checks the XML against a Document Type Definition (DTD), which may be part of the XML or external to it.
确认过程根据文档类型定义(DTD)来检查XML, DTD可以是XML的一部分，也可以在它的外部。
If you don't have a DTD or XML schema, though, external entity references won't work, so don't even try it.
可是，如果没有DTD或XML模式，外部实体引用就不能工作，因此也就根本不需要去尝试。
This DTD can be the internal subset of an XML document, if you wish, or it can be an external file.
这个DTD可能是XML文档的内部子集，如果愿意，它也可以是外部文件。
Notations are part of the full regalia of DTDs, and I've included within the file a DTD internal subset that's required to declare the entity for the external file.
表示法是DTD完整标记的一部分，我们在这个文件中包含了一个DTD内部子集，它用来为外部文件声明实体。
You have learned how to use a DTD to define the legal elements of an XML document, and how the DTD can be declared inside your XML document, or as an external reference.
你已经知道了如何使用DTD来定义XML文件中的合法元素，以及如何将DTD从你的XML文件中或将其作为外部参数来声明。
The DTD can also live in an external document that is referenced by the document being parsed.
DTD还可以存在于要剖析之文件所参考的外部文件中。
The DTD can also live in an external document that is referenced by the document being parsed.
DTD还可以存在于要剖析之文件所参考的外部文件中。
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