HTML
XHTML namespace :
<html xmlns="http://www.w3.org/1999/xhtml">
XHTML is strong formatted of "html", but it's really compatible with HTML. It's good for parser; however, it just not in the main stream and kind of dead due to no compete with html.HTML 5 namespace
It's more confusing about who take care HTML standard. W3C or WHATWG?
To be as HTML 5, a web page must be start with
<!DOCTYPE html>
MathML namespace It's Math equation presentation and can be embed into HTML.
SVG namespace It's vector graph and can be embed into HTML.
XSLT namespace
It's server side transformation to convert XML to HTML.
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