Deep reference for building a document project - the file formats and processing pipeline underneath the in-app editors covered in UI Reference.

• Document Project Structure - the project folder, what each file is for, the two ways to build (in-app vs. by hand).
• Layout JSON - overlay.json and other layout partials, how process.js composes them, multi-page.
• Scripting & Processing - the full generation pipeline and where each scripting/expression engine applies.
  • validate.js - cross-field validation.
  • process.js - layout assembly, computed presentation data.
  • Debugging - when something doesn't show up right.
• Generating Grid Data - building a grid block's data from a repeating group.
• Autocomplete JSON - the autocomplete.json format.
• Command-Line Launch Options - desktop kiosk/ unattended deployment.
• Troubleshooting

For the in-app editors themselves (Form Editor, Layout Editor, etc.), see UI Reference.