@conference {17790,
	title = {RDF aggregate queries and views},
	booktitle = {Data Engineering, 2005. ICDE 2005. Proceedings. 21st International Conference on},
	year = {2005},
	month = {2005/04//},
	pages = {717 - 728},
	abstract = {Resource description framework (RDF) is a rapidly expanding Web standard. RDF databases attempt to track the massive amounts of Web data and services available. In this paper, we study the problem of aggregate queries. We develop an algorithm to compute answers to aggregate queries over RDF databases and algorithms to maintain views involving those aggregates. Though RDF data can be stored in a standard relational DBMS (and hence we can execute standard relational aggregate queries and view maintenance methods on them), we show experimentally that our algorithms that operate directly on the RDF representation exhibit significantly superior performance.},
	keywords = {aggregate, databases;, DBMS;, description, framework;, languages;, Maintenance, methods;, processing;, queries;, query, RDF, relational, resource, standard;, standards;, view, Web},
	doi = {10.1109/ICDE.2005.121},
	author = {Hung,E. and Deng,Yu and V.S. Subrahmanian}
}
@conference {15524,
	title = {Semantic query optimization for object databases},
	booktitle = {Data Engineering, 1997. Proceedings. 13th International Conference on},
	year = {1997},
	month = {1997/04//},
	pages = {444 - 453},
	abstract = {Presents a technique for semantic query optimization (SQO) for object databases. We use the ODMG-93 (Object Data Management Group) standard ODL (Object Database Language) and OQL (Object Query Language) languages. The ODL object schema and the OQL object query are translated into a DATALOG representation. Semantic knowledge about the object model and the particular application is expressed as integrity constraints. This is an extension of the ODMG-93 standard. SQO is performed in the DATALOG representation, and an equivalent logic query and (subsequently) an equivalent OQL object query are obtained. SQO is based on the residue technique of Chakravarthy et al. (1990). We show that our technique generalizes previous research on SQO for object databases. It can be applied to queries with structure constructors and method application. It utilizes integrity constraints about keys, methods and knowledge of access support relations, to produce equivalent queries, which may have more efficient evaluation plans},
	keywords = {application;object, constraints;keys;method, constructors;DATALOG;data, databases;object-oriented, databases;query, Datalog, Evaluation, integrity;data, languages;query, Logic, object, optimization;structure, plans;residue, processing;software, query, query;access, query;integrity, relations;equivalent, representation;ODL, schema;ODMG-93, standard;OQL, standards;, structures;object-oriented, Support, technique;semantic},
	doi = {10.1109/ICDE.1997.581983},
	author = {Grant,J. and Gryz,J. and Minker, Jack and Raschid, Louiqa}
}
