DTD and JAVA versions


I am going through below link


I was not clear on DTDs and Java version relationship and which one to use in WEB.XML.

Please advise
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I am not an expert on XML stuff. But, I do remember using DTD for web.xml  years ago. The link you posted says
Starting with the J2EE 1.4 specification, each specification requires its Deployment Descriptor be validated with respect to an XML Schema ...

From the programmer's  point of view, the biggest improvement that XML schema gave us was that we didn't have to worry about the order of the tags anymore.   See the paragraph titled "Schema" at  http://www.javaworld.com/article/2073323/java-web-development/servlet-2-4--what-s-in-store.html?page=2    
For some background about DTDs and Schemas, see  https://www.sitepoint.com/xml-dtds-xml-schema/    
I can't answer any technical questions about XML stuff. I am just glad that they changed to using Schema instead of DTD. Prior to the change, if the tag order wasn't just right  our web apps would not work.

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