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    AMW
    2010
    227views Knowledge Management» more  AMW 2010»
    SQL Nested Queries in SPARQL
    13 years 10 months ago
    SQL Nested Queries in SPARQL
    Download  sunsite.informatik.rwth-aachen.de
    SPARQL currently does not include any form of nested queries. In this paper we present a proposal to incorporate nested queries into SPARQL along the design philosophy of SQL neste...
    Renzo Angles, Claudio Gutierrez
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    AMW
    2009
    171views Knowledge Management» more  AMW 2009»
    A Nested Graph Model for Visualizing RDF Data
    14 years 9 days ago
    A Nested Graph Model for Visualizing RDF Data
    Download  sunsite.informatik.rwth-aachen.de
    This paper presents an abstract data model for visualizing RDF data based on the notion of nested graphs. Our study gives theoretical results that shows directions to enhance the r...
    Renzo Angles
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    AMW
    2009
    151views Knowledge Management» more  AMW 2009»
    Temporal Support in Sequential Pattern Mining
    14 years 9 days ago
    Temporal Support in Sequential Pattern Mining
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    In sequential pattern discovery, the support of a sequence is computed as the number of data-sequences satisfying a pattern with respect to the total number of data-sequences in th...
    Leticia I. Gómez, Bart Kuijpers, Alejandro ...
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    AMW
    2009
    181views Knowledge Management» more  AMW 2009»
    Consistent Query Answering in Data Warehouses
    14 years 9 days ago
    Consistent Query Answering in Data Warehouses
    Download  people.scs.carleton.ca
    Abstract. A Data Warehouse (DW) is a data repository that organizes and physically integrates data from multiple sources under special kinds of schemas. A DW is composed by a set o...
    Leopoldo E. Bertossi, Loreto Bravo, Mónica ...
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    AMW
    2009
    164views Knowledge Management» more  AMW 2009»
    Bi-Level Mapping: Combining Schema and Data Level Heterogeneity in Peer Data Sharing Systems
    14 years 9 days ago
    Bi-Level Mapping: Combining Schema and Data Level Heterogeneity in Peer Data Sharing Systems
    Download  sunsite.informatik.rwth-aachen.de
    Abstract. Peer data sharing systems use either schema-level or data-level mappings to resolve schema as well as data heterogeneity among data sources (peers). Schema-level mappings...
    Md. Anisur Rahman, Mehedi Masud, Iluju Kiringa, Ab...
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    AMW
    2009
    182views Knowledge Management» more  AMW 2009»
    Data Expiration and Aggregate Queries
    14 years 9 days ago
    Data Expiration and Aggregate Queries
    Download  sunsite.informatik.rwth-aachen.de
    We investigate the space requirements for summaries needed for maintaining exact answers to aggregate queries over histories of relational databases. We show that, in general, a su...
    David Toman
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    AMW
    2009
    133views Knowledge Management» more  AMW 2009»
    T3: On Mapping Text To Time Series
    14 years 9 days ago
    T3: On Mapping Text To Time Series
    Download  pike.psu.edu
    We investigate if the mapping between text and time series data is feasible such that relevant data mining problems in text can find their counterparts in time series (and vice ver...
    Tao Yang, Dongwon Lee
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    AMW
    2009
    122views Knowledge Management» more  AMW 2009»
    Stop the Chase: Short Contribution
    14 years 9 days ago
    Stop the Chase: Short Contribution
    Download  www.informatik.uni-freiburg.de
    Abstract. The chase procedure, an algorithm proposed 25+ years ago to fix constraint violations in database instances, has been successfully applied in a variety of contexts, such ...
    Michael Meier 0002, Michael Schmidt, Georg Lausen
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    AMW
    2009
    154views Knowledge Management» more  AMW 2009»
    From Database Repair Programs to Consistent Query Answering in Classical Logic (extended abstract)
    14 years 9 days ago
    From Database Repair Programs to Consistent Query Answering in Classical Logic (extended abstract)
    Download  sunsite.informatik.rwth-aachen.de
    Leopoldo E. Bertossi
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    AMW
    2009
    130views Knowledge Management» more  AMW 2009»
    Semantic Integrity Constraints for Spatial Databases
    14 years 9 days ago
    Semantic Integrity Constraints for Spatial Databases
    Download  sunsite.informatik.rwth-aachen.de
    Abstract. This paper introduces a formalization of a set of spatial semantic integrity constraints on an extended-relational database model. The formalization extends traditional n...
    Loreto Bravo, M. Andrea Rodríguez
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