| Namespace URI Declaration | Purpose |
|---|---|
| xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml" | HTML |
| xmlns:mathml="http://www.w3.org/1998/Math/MathML" | MathML |
| xmlns:svg="http://www.w3.org/2000/svg" | SVG |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | XML schema instance document |
| "http://www.w3.org/XML/1998/namespace" (implicit) | XML |
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