Future Challenges
n Interoperability:
  • nexploiting ontologies in QO.
  • nConstraint Inference: exploit simple special structure of mapping specs.
  • nQuery enveloping and scheduling.
nSupporting multiple hierarchies at once:
  • nE.g., authors under books, under geographically grouped institutions, and under a topic hierarchy of research interests.
  • nSupport powerful ad hoc as well (OLAP-style) analysis queries
nSupport the above over a warehouse without full materialization


nHigh level semantic querying of data on the (semantic) web and in the warehouse