```js !!mdbook.export title:'TFGrid Specs 4.0' name:'tfgrid4specs' description:'This book provides detailed specifications and technical information about TFGrid 4.0.' summary_url:'https://git.ourworld.tf/tfgrid/info_tfgrid/src/branch/main/books/tfgrid4specs' collections:'tfgrid4specs, tech, tfgrid4' production:0 //means we put it in summary ```