MathML structure

XML Elements in MathML are:

Presentation markup elements:

Describing the notation directly (see previous example): rows, fractions, operators, etc. It captures the notational structure.

Content markup elements:

Explicit encoding of the mathematical content. It captures the mathematical structure.

The (only) interface element:

math element, which binds a formula to the surrounding XML/HTML.

Large number of entities

For integral and differential signs, greek letters, etc.