Many other relational data sources
Example: Evidence Extraction and Link Discovery (EELD): A DARPA-funding project that emphasizes multi-relational and multi-database linkage analysis
The objective of the EELD Program is to research, develop, demonstrate, and transition critical technology that will enable significant improvement in our ability to detect asymmetric threats …, e.g., a loosely organized terrorist group.
… Patterns of activity that, in isolation, are of limited significance but, when combined, are indicative of potential threats, will need to be learned.
Addressing these threats can only be accomplished by developing a new level of autonomic information surveillance and analysis to extract, discover, and link together sparse evidence from vast amounts of data sources, in different formats and with differing types and degrees of structure, to represent and evaluate the significance of the related evidence, and to learn patterns to guide the extraction, discovery, linkage and evaluation processes.