Web.xml configuration about a detailed description of One definition of the head and root element Deployment descriptor file as XML document, like all, must be based on an XML start. The first statement can be To use the XML version and give the document character encoding. DOCYTPE declaration must appear immediately after the first at this. This statement applies to tell the server servlet specification version (Such as 2.2 or 2.3) and designate the remaining part of the contents of this document the grammar of the DTD (Document Type Definition, Document Type Definition). Deployment descriptor file of all the top-level (root) element for the web-app. Please note, XML elements, unlike HTML, they are Case-sensitive. Therefore, web-App and the WEB-APP is not legitimate, web-app must be lowercase. 2 deployment descriptor element of the order of document XML elements are not only case-sensitive, and they also appear in other elements of the order-sensitive. For example,

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