XML Guide-XML validation

Syntax-compliant XML documents are well-structured XML documents. An XML document verified by DTD is a valid XML document. Syntax-compliant XML documents are well-structured XML documents.
An XML document verified by DTD is a valid XML document.



"Well-structured" XML document
A well-structured XML document should use the correct syntax.
A well-structured XML document should comply with XML syntax rules. The example given in the previous chapter is a well-structured XML document:

 

 

  
   
Tove

  

  
   
Jani

  

  
   
Reminder

  Don't forget me this weekend!

 

"Valid" XML document
A valid XML document must comply with the DTD description.
A valid XML document is also a well-structured XML document and must comply with the DTD rules.

 

 

  
   
Tove

  

  
   
Jani

  

  
   
Reminder

  Don't forget me this weekend!

 

XML DTD
DTD defines valid elements available in XML documents.
The intention of DTD is to define the legal building module of the XML document. He defines a series of legal elements to determine the internal structure of the XMl document. A well-structured XML document is not necessarily a valid XML document, but a valid XML document must be a well-structured XML document. If you want to know