Semantic Streams

Manfred Hauswirth, Danh Le Phuoc, Josiane Xavier Parreira

Abstract:

Linked streams; RDF streams
A semantic stream S is an unbounded partially ordered set of tuples 〈G, τ〉 where G is a directed labeled graph that follows a semantic data model and the values of τ define a partial order among the tuples. In existing semantic stream models, stream elements are semantically annotated following the W3C Resource Description Framework (RDF) semantic data model, i.e., G is a set of RDF triples. Typical examples for τ would be integers (to define a simple ordering relationship, e.g., logical time), timestamps, coordinates, intervals, or combinations of those.
The heterogeneous nature of stream data sources makes accessing and managing their data a labor-intensive task, which currently requires a lot of manual programming and data integration. To remedy these issues, the RDF data model, based on its success for information integration on the Web, was investigated for its suitability for stream processing, as it enables...