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It is a formal description of the structure of an XML document, i.e., which elements are allowed, which elements must be present, which elements are optional, the sequence and relationship of the elements.Document Type Definition (DTD) is used to define the structure of an XML document.The HTML's original objective of letting the document author to focus on the contents of the document and leave the actual appearance of the document to the browser, has gone out of control.Many HTML documents have more markup tags than the contents.It also helps in standardizing a certain class of documents.
It specifies a set of constraints and establishes the trees that are acceptable in an XML document.DOM is a platform- and language-independent interface for processing XML documents. The DOM parser loads the XML document, builds an object model in the memory, in the form of a tree comprised of nodes. The DOM API defines the mechanism for querying, traversing and manipulating the object model built. The DOM API defines the mechanism for querying, traversing the tree; and adding, modifying and deleting the elements and nodes. It is a subset of Standard General Markup Language (SGML). It is developed and maintained by World-Wide Web Consortium (W3C) @ (W3C also maintains specifications for HTTP, HTML, XHTML, CSS, among others.) XML is a family of technologies, which includes: I assume that you have some basic understanding of the HTML.