Basic Knowledge about XML

When talking about XML, we may think of HTML. Actually, XML is similar to HTML are tag-based languages. The difference between XML and HTML is that the tags which XML uses are not predefined. If we want to create own tags within XML, we need to follow a few rules.

Firstly, only one root element is contained in XML document. The root element is often taken as document element and appears after the prolog section. Besides, all the XML elements should contain end ...