Queries with incomplete answers over semistructured data
PODS '99 Proceedings of the eighteenth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Querying Semantically Tagged Documents on the World-Wide Web
NGIT '99 Proceedings of the 4th International Workshop on Next Generation Information Technologies and Systems
Building HyperView Wrappers for Publisher Web-Sites
ECDL '98 Proceedings of the Second European Conference on Research and Advanced Technology for Digital Libraries
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W3QL is a, SQL-like, high level language for accessing World-Wide Web (WWW) resident data and services. W3QL is declarative. A W3QL query specifies a graph to be matched with portions of the WWW (graph nodes corresponding to WWW pages, edges to hypertext links). A query can specify complex conditions on nodes' contents and their relationships. A W3QL query may use existing search services (e.g. AltaVista). W3QL is extensible as users may use their own data analysis tools (e.g. image analysis). W3QS is a system that manages W3QS queries. W3QS is accessible via the WWW or by using a programming based interface (API). On the WWW, W3QS provides several interfaces: intuitive graphic interfaces, templates of frequently posed queries, and direct programming.