Each public administration contributing to the provision of a European public
service works within its own national legal framework. Legal interoperability is
about ensuring that organisations operating under different legal frameworks,
policies and strategies are able to work together. This might require that
legislation does not block the establishment of European public services within
and between Member States and that there are clear agreements about how to
deal with differences in legislation across borders, including the option of putting
in place new legislation
Source: The New EIF. https://ec.europa.eu/isa2/eif_en
The new European Interoperability Framework (EIF) is part of the Communication (COM(2017)134) from the European Commission adopted on 23 March 2017. The framework gives specific guidance on how to set up interoperable digital public services.