| A Bird View |    4 |
| XML et. al. | <math class="inline"> <mrow><mo>(</mo><mi>a</mi> <mo>-</mo> <mi>b</mi><mo>)</mo></mrow>
<mrow><mo>(</mo><mi>a</mi> <mo>+</mo> <mi>b</mi><mo>)</mo></mrow> <mo>=</mo> <msup><mi>a</mi>
<mrow><mn>2</mn></mrow> </msup> <mo>-</mo> <msup><mi>b</mi> <mrow><mn>2</mn></mrow>
</msup></math> |
|---|---|
| machine-oriented languages for exchanging and manipulating content | |
| LaTeX | $ (a - b)(a + b) = a^2 - b^2 $ |
| human-oriented text-based interface for authoring content | |
| TeX |  |
| paper-oriented formatter for content | |