Integration or Mashup? Challenges in Bringing Together Heterogeneous Scientific Data

Chaitanya K. Baru
This paper provides an overview of the range of techniques available for integration of heterogeneous data. These range from the wrapper-mediator architecture for integration of structured and semistructured databases: semantic mediation, which involves mapping schema elements and data values to ontologies: to ad hoc, vertical data integration where the user is in the loop of the integration. Every integration technique requires an expert in the loop�at different points in time and at different places in...