This paper presents our work on supporting flexible query evaluation over large distributed, heterogeneous, and autonomous sources. Flexibility means that the query evaluation process can be configured according to application contextspecific, resources constraints and also can interact with its execution environment. Our query evaluation is based on Query Brokers as basic units which allow the...

Since XML seems to be the next great wave on the web, several query languages for XML have been proposed. Unfortunately, none of these proposals comes even elose to meet the requirements for such a query language. We review the requirements for a query language for XML and propose a new query language, YAXQL, which meet them.

web search engines are one of the most popular tools on the internet which are widely-used by expert and novice users. constructing an adequate query which represents the best specification of users’ information need to the search engine is an important concern of web users. query expansion is a way to reduce this concern and increase user satisfaction. in this paper, a new method of query expa...

Since XML seems to be the next great wave on the web, several query languages for XML have been proposed. Unfortunately, none of these proposals comes even close to fullll the requirements for such a query language. We review the requirements for a query language for XML and propose a new query language, YAXQL, which fulllls these requirements.

What are the impacts of a data model and a query language on user query performance? This is a longstanding research question about database query. Current knowledge has provided their combined effect. A data model comprises structures and operations, and could be decoupled from a query language. It is theoretically possible to identify the effects from a data model (without the query language)...

This paper reports on a pragmatic query language for Racer. The abstract syntax and semantics of this query language is defined. Next, the practical relevance of this query language is shown, applying the query answering algorithms to the problem of consistency maintenance between object-oriented design models.

PySBQL (Python-like Stack Based Query Language) is a full scale programming and query language. Its syntax is based upon the Python’s syntax, which makes PySBQL highly readable and easy to use. Contrary to the classical approach in query languages, semantics is defined using a common structure for programming languages – the Environment Stack (ENVS). As a query language it is similar to SBQL pr...

URL to Code Chinook http://www.bcgsc.bc.ca/chinook/ myGRID http://www.mygrid.org.uk/ AceDB Query Language http://www.acedb.org/Cornell/ aboutacedbquery.html AQL Acedb Query Language http://www.acedb.org/ Software/whelp/AQL/ Lorel Lore Query Language http://infolab.stanford. edu/lore/ BioVelo Query Language http://www.biocyc.org/ bioveloLanguage.html BioCyc Pathway Tools http://bioinformatics.ai...

In this paper we investigate how to use logic programming (in particular, Prolog) as query language against OWL resources. Our query language will be able to retrieve data and meta-data about a given OWL based ontology. With this aim, firstly, we study how to define a query language based on a fragment of Description Logic, then we show how to encode the defined query language into Prolog by me...

In this paper we investigate how to use logic programming (in particular, Prolog) as query language against OWL resources. Our query language will be able to retrieve data and meta-data about a given OWL based ontology. With this aim, firstly, we study how to define a query language based on a fragment of Description Logic, then we show how to encode the defined query language into Prolog by me...