doc2 - Due to the fact that XHTML is an XML application...

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Due to the fact that XHTML is an XML application, certain practices that were perfectly legal in SGML-based HTML 4 must be changed. You already have seen XHTML syntax in previous chapter, so differences between XHTML and HTML are very obvious. Following is the comparison between XHTML and HTML. XHTML Documents Must be Well-Formed Well-formedness is a new concept introduced by XML. Essentially, this means all the elements must have closing tags and you must nest them properly. CORRECT: Nested Elements <p> Here is an emphasized <em> paragraph </em> . </p> INCORRECT: Overlapping Elements <p> Here is an emphasized <em> paragraph. </p></em> Elements and Attributes Must be in Lower Case XHTML documents must use lower case for all HTML elements and attribute names. This difference is necessary because XHTML document is assumed to be an XML document and XML is case-sensitive. For example, <li> and <LI> are different tags. End Tags are Required for all Elements In HTML, certain elements are permitted to omit the end tag. But XML does not allow end tags to be omitted.
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