Information Systems: Editorial

Research efforts on structured data, multimedia, and services have involved non-overlapping communities. However, from a user perspective, the three kinds of information should behave and be accessed similarly. Instead, a user has to deal with different tools in order to gain a complete knowledge about a domain. There is no integrated view comprising data, multimedia and services retrieved by the specific tools that is automatically computed. A unified approach for dealing with different kinds of information may allow searches across different domains and different starting points / results in the searching processes.Multiple and challenging research issues have to be addressed to achieve this goal, including: mediating among different models for representing information, developing new techniques for extracting and mapping relevant information from heterogeneous kinds of data, devising innovative paradigms for formulating and processing queries ranging over both (multimedia) data and services, investigating new models for visualizing the results and allowing the user to easily manipulate them.This special issue "Semantic Integration of Data, Multimedia, and Services" presents advances in data, multimedia, and services interoperability.