HTML and XML are structural foundations of every website or application. It is crucial that developers learn — and master — both.

The trouble is that the statement “100% XML-compliant” refers only to the syntax, not the spirit. It is entirely possible to create closed, proprietary IT systems that are 100% XML based.

2. Web browsers prefer HTML that is properly formatted like this. HTML has specific syntax and semantics to address presentation issues like layout, fonts, and so on. XML is stricter as is XHTML.

XMLFox XML Editor is a nice freewareprogram that greatly simplifies these tasks. For the uninitiated, XML is a distant cousin to HTML, thelanguage used to describe Web pages.