# Datum formulas

This file contains formulas written in MathML for inclusion in the Javadoc of some classes in the `org.apache.sis.referencing.datum` package. Those formulas are provided in separated files for easier edition and for avoiding `javac` or `javadoc` “unknown HTML tag” errors with JDK 8. Fragment of this files are inserted in the Javadoc by the following tag:

>     {@include formulas.html#title}

where title is the text inside `<h2>…</h2>` elements just before the parts to copy in the javadoc. The `{@include}` taglet is defined in the `sis-build-helper` module.

## Bursa-Wolf

X t Y t Z t = (1+dS) ⋅ 1 -r z +r y +r z 1 -r x -r y +r x 1 × X s Y s Z s + t x t y t z