Stream Reasoning and Complex Event Processing in ETALIS
Addressing dynamics and notifications in the SemanticWeb realm has recently become an important area of research.
Run time data is continuously generated by multiple social networks, sensor networks, various on-line services, and so forth. How
to get advantage of this continuously arriving data (events) remains a challenge – that is, how to integrate heterogeneous event
streams, combine them with background knowledge (e.g., an ontology), and perform event processing and stream reasoning. In
this paper we describe ETALIS – a system which enables specification and monitoring of changes in real time. Changes can
be specified as complex event patterns, and ETALIS can detect them in real time. Moreover the tool can perform reasoning
over streaming events with respect to background knowledge. ETALIS implements two languages for event patterns: ETALIS
Language for Events, and Event Processing SPARQL. ETALIS has various applicabilities in capturing changes in semantic
networks, broadcasting notifications to interested parties, and creating further changes (based on processing of the temporal,
static, or slowly evolving knowledge).