使用 Notepad++ 进行内部 DTD 验证

Question

我是 XML 的新手，正在尝试使用 DTD 创建一个简单的 XML。

我正在通过 XML Tools blugin 使用 Notepad++ 进行验证。

这是我的带有内部 DTD 的 XML 代码。

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE People [
    <!ELEMENT People (name, phone*)>
    <!ELEMENT name (#PCDATA)*>
    <!ELEMENT phone (#PCDATA)*>   
    <!ATTLIST phone type (home) #REQUIRED>
]>

<People>
    <name> John Smith </name>
    <phone type="home">+1 (123) 456-7890 </phone>
</People>

如果我保留 'standalone="yes"'，我会收到以下错误 "ERROR: standalone: People declared in the external subset contains white spaces nodes"。如果我删除它，代码将通过验证而不会出现任何问题。

谁能解释为什么 'standalone="yes"' 的存在会导致问题？谢谢。

P.S。请在标记为重复之前仔细阅读上述问题的描述。

Answer 1

Validity constraint: Standalone Document Declaration

The standalone document declaration must have the value "no" if any external markup declarations contain declarations of:

attributes with default values, if elements to which these attributes apply appear in the document without specifications of values for these attributes, or

entities (other than amp, lt, gt, apos, quot), if references to those entities appear in the document, or

attributes with tokenized types, where the attribute appears in the document with a value such that normalization will produce a
different value from that which would be produced in the absence of
the declaration, or

element types with element content, if white space occurs directly within any instance of those types.

参考 : Extensible Markup Language (XML) 1.0 (Fifth Edition)

使用 Notepad++ 进行内部 DTD 验证

Internal DTD validation using Notepad++

xml

validation

dtd

notepad++