Some tags in XML are not displaying in browser [closed]

Some tags in XML are not displaying in browser [closed]

References

Reference NO 1

http://www.w3schools.com/xml/xml_syntax.asp

Reference NO 2

https://support.mozilla.org/questions/767490

Reference NO 3

http://en.wikipedia.org/wiki/HTML

Reference NO 4

http://webdesign.about.com/od/htmltags/qt/optional-html-end-tags-when-to-include-them.htm

Reference NO 5

http://www.webdevout.net/articles/beware-of-xhtml

Reference NO 6

http://www.codeproject.com/Articles/845/Beginning-XML-Chapter-2-Well-Formed-XML

Reference NO 7

http://symbolcodes.tlt.psu.edu/web/tips/declare.html

Reference NO 8

http://stackoverflow.com/questions/348736/is-writing-self-closing-tags-for-elements-not-traditionally-empty-bad-practice