Capability-sensitive query processing on Internet sources

On the Internet, the limited query processing capabilities of sources make answering even the simplest queries challenging. We present a scheme called GenCompact for generating capability-sensitive plans for queries on Internet sources. The query plans generated by GenCompact have the following advantages over those generated by existing query processing systems: the sources are guaranteed to support the query plans; the plans take advantage of the source capabilities; and the plans are more efficient since a larger space of plans is examined.