This is not an attribute, but the namespace pseudo-attribute. The value provides a prefix to use for the MathML elements. All namespace prefixes must be associated with a URL, and the prefix “ mml ” has been set to the URL for the World Wide Web Consortium (W3C) MathML 2.0 Tag Set.
| Value | Meaning |
|---|---|
| http://www.w3.org/1998/Math/MathML | The prefix “ mml ” has been set to the URL for the W3C MathML 2.0 Tag Set. |
| Restriction: This attribute value may not be changed. | |