Companion guide (PPDP19) (see below if the link is dead).

Spacetime programming is a programming language on top of Java to describe search strategies exploring combinatorial state-space such as in constraint satisfaction problems. Please consult the spacetime manual for more information.

You might want to build the manual from the repository because you need it to be synchronized with a specific version of Bonsai or simply for offline usage. Download the utility mdbook:

cargo install mdbook

Once installed, go inside bonsai/doc and execute mdbook build -o. The manual is generated inside a local folder named book and is directly opened in your browser.