The expl3 package and L A TEX3 programming (expl3.pdf) [2] The l3build Package (l3build.pdf) [3] The L A TEX3 Interfaces (interface3.pdf) [4] The L A TEX3 kernel: style guide for code authors (l3styleguide.pdf) Special Thanks ▶ Frank Mittelbach ▶ Joseph Wright Happy expl3ing!! 27 / 27