Basic Structure of Formula Encoding
Formulas are first tagged with an empty <formula/> element. In a second capturing step, the formulas can be transcribed according to the TeX notation and enclosed using <formula>[...]</formula>. The <formula> element gets an attribute @notation, in which the notation ("TeX" or "MathML") is specified. In another attribute @facs, a graphical representation of the corresponding formula can be referenced.
- mathematical and physical formulas and equations,
- fractions (with fraction line; if not available as Unicode entity),
- chemical compounds,
- expressions of logic.
<formula>.Formulas can be either within a line (inline) or separated from the continuous text. In the latter case, the line break is specified before and after the formula using <lb/>. If there is a punctuation mark immediately after a formula, it is included. Layout information (e. g. centering) is not taken into account.
Encoding of Formulas (1)
<formula notation="TeX"> \lambda_T = \frac{1}{\pi ns^2}\int\limits_0^\infty\frac{4x^2e^{-x^2}dx}{\psi(x)+\frac{n_1\sigma^2}{ns^2}\psi\left(x\sqrt\frac{m_1}{m}\right)} </formula>
Source: Boltzmann, Ludwig: Vorlesungen über Gastheorie. Bd. 1. Leipzig, 1896. [Facsimile 87]
Encoding of Formulas (2)
<formula notation="TeX"> U=u_1 \, \left ( \frac{z_1}{z_2} \cdot \frac{z_3}{z_4} - 1 \right ) </formula>
Encoding of Formulas (3)
<p>Wir setzen wieder<lb/> <formula notation="TeX">\frac{\cos kr}{r} = f_r + \frac{1}{r}</formula>,<lb/> <formula notation="TeX">\Psi = \Psi' + \Psi''</formula>,<lb/> <formula notation="TeX">\Psi' = \int pf_rd\omega</formula>,<lb/> <formula notation="TeX">\Psi'' = \int p\frac{1}{r}d\omega</formula>. </p><lb/>