Introduction 

The extension provides a number of database tables and corresponding classes for use in the various dependent data models in the CHF. This includes humanities-specific data such as Location, Period, and Actor, but also more generic classes like SameAs. In the same vein of being a service extension for other data models, CHF Base also includes key third-party libraries like Leaflet, infrastructure to import and serialise data, to compile search configuration, and to build user interfaces. The latter is realised in the form of generic Fluid templates that sitepackages may use as-is, but also by means of a CSS library with complimentary JavaScript to build accessible and responsive web apps from atomic components.