Access to the VA_DB module enables direct research in the primary project data. This access can either be granted by a person (via the VA_WEB module) or by machines or programmes. The latter scenario exists, for one thing, within the project during communication between the VA_WEB and VA_DB modules, but it also concerns automatic access, e.g., from computers or programmes of the VA project partners. During the development in the area of the VA_WEB and VA_DB modules, it is often necessary to change existing data structures and adapt them to new requirements from an IT or programming point of view. In the case of access by a human, this can lead to confusion; in the case of access by a machine or programme, it simply leads to a malfunction. To counter this problem, an at least largely stable data structure is interposed within VA_DB. The variable primary data structures are projected into this so-called data access layer. In the central MySQL project database (VA_DB), the respective interfaces are captured in the form of several tables. The tables z_ling (for linguistic data) and z_geo (for geographical data) are optimised for access by machines. The interfaces vap_ling and vap_geo, which are designed for human access, are available as database tables in several language versions and can be identified by corresponding name suffixes. Currently (October 2020), the following vap-tables exist: vap_ling_de, vap_ling_it, vap_ling_fr, vap_ling_si; vap_geo_de, vap_geo_fr. The detailed documentation of the data saved within these interfaces can be found under Datenbank-Dokumentation.