Contrasting XML and HTML
		XML is case sensitive; HTML is not. HTML is often forgiving if you forget to close a tag, such as </LI>.  If XML requires a close tag, it must be present for the file to be valid. On the other hand, if a tag does not have a corresponding end tag in XML, you must close the tag itself with  /> instead of >.   Example: either < begin tag > and </ end tag >  or < one tag only /> In XML, quotation marks are required for properties.  They are optional in HTML. In XML, all properties must have values.  XML Document Structure