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• Modules: Create a module on the file system. See Creating a light module. 
• Template definitions: Write page, area and components definitions in YAML. See Template definition.
• Site template prototype definitions: Write template prototype definitions in YAML. See Template prototype.
• Template scripts: Write template scripts in FreeMarker and store them on the file system. See Template scripts. 
• Dialog definitions: Write dialog definitions (templates and apps) in YAML and store them on the file system. See Dialog definition.
• Resource files: Store resource files on the file system. See resource origins and loading order.
• App definitions: Define content apps in YAML and store them on the file system. See Creating a custom content app.
• Include YAML files: Reuse a YAML definition in another definition using the include mechanism. 
• Templating functions: Use templating functions instead of template models to define business logic in your scripts. See Templating functions.
• i18n: Store i18n properties files on the file system.
• Module dependencies: Manage module dependencies in a YAML-based module descriptor.
• Decorations: Reuse and modify existing configuration through decoration. 
• Bootstrapping: Bootstrap content into the JCR using the Content Importer module.
• Theme: Configure a theme on the file system in YAML.
• Templating functions: Use templating functions in your scripts. See Templating functions.
• Use JavaScript Models. See JavaScript Models module, How to work with JavaScript models.
• Virtual URI mappings: Create short, convenient URLs that do not match the site hierarchy exactly. See Virtual URI mappings.
• REST endpoint definitions: Configure multiple endpoints for the Delivery endpoint of for your custom REST endpoint.

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