Our device profile database is stored as a hierarchical filesystem structure - one directory per device vendor, each containing per-device subdirectories. Each device directory contains a C header file with information about the device formatted as C preprocessor definitions, and a textual reference to the associated runtime. The profile header file can be used in MoSync programs to automatically modify their functionality depending on the target device: Common information in profiles include vendor and device names, screen size and API availability, for example Bluetooth or Location.