Contact Person: Dr. Martin Doerr Complete Description (pdf file) Complete Documentation (including users' manuals & programmers' manuals) The Semantic Index System (SIS) is a tool for describing and documenting large evolving varieties of highly interrelated data, concepts and complex relationships, as opposed to large homogeneous populations in fixed formats (handled by traditional DBMS). As such, it is suited for the representation of scientific knowledge, engineering constructs and metadata. These kinds of data are also characterised by relative stability, i.e. they undergo few updates by comparison to, say, administrative, financial or observational data, which give rise to continuously changing sets of uniform items. SIS has been developed by the scientific team of ISL, under the supervision of Martin Doerr & Panos Constantopoulos.