... of heterogeneous data such as XML over the Web or in XML databases. By means of mappings from source to target schemas, Clio can ... precise semantics of data transformation and integration. In this paper we study the problem of how to efficiently implement such data ...
Publication - erhard - 06/15/2023 - 06:42 - 0 comments - 1 attachment
... data formats continues to be an important problem in modern information systems. Schema Matching, the process of matching ... tool developed at the IBM Almaden Research Center. In this demonstration we showcase Clio’s mapping engine that allows mapping ...
Publication - massmann - 04/17/2013 - 10:16 - 0 comments - 1 attachment
... Venue: In Proceedings of VLDB, pages 598--609, 2002 ... Mapping and translating data stored in dierent formats continues to be an important problem in modern information ...
Publication - massmann - 04/17/2013 - 09:27 - 0 comments - 0 attachments
... it is rare that a schema mapping possesses an inverse. In this paper, we introduce and study the notion of a quasi-inverse of a ... negative results about the existence of quasi-inverses. In particular, we show that every LAV (local-as-view) schema mapping has a ...
Publication - huliganka - 04/17/2013 - 02:49 - 0 comments - 1 attachment
... or XML schemas, and can be independently designed. In addition to the source-to-target mappings, we consider as part of the ... at the target. We define the semantics of query answering in such an integration scenario, and design two novel algorithms, basic query ...
Publication - huliganka - 04/17/2013 - 00:38 - 0 comments - 1 attachment
... 666.47 KB Many problems in information integration rely on specifications, called schema mappings, that ... for both relational and nested data are well-known. In this work, we present a new formalism for schema mapping that extends these existing formalisms in two significant ways. First, our nested mappings allow for nesting and ...
Publication - huliganka - 04/17/2013 - 00:05 - 0 comments - 1 attachment
... be a Σ1-query. An (equivalent) reformulation of q1 in the presence of C is a Σ2-query, q2, such that q2 gives the same ... ∪ Σ2-database instance that satisfies C. In general, there may exist multiple such reformulations and choosing among ...
Publication - huliganka - 04/16/2013 - 23:38 - 0 comments - 1 attachment
... effect as applying successively the two schema mappings. In this paper, we give a rigorous semantics to the composition of schema ... We first study the important case of schema mappings in which the specification is given by a finite set of source-to-target ...
Publication - cat - 04/16/2013 - 19:16 - 0 comments - 1 attachment
... for heterogeneous data exchange. Its popularity is due in large part to the ease with which diverse kinds of information can be ... exchanging such information between autonomous sources. In the absence of controlling standards, such sources will typically choose ...
Publication - cat - 04/16/2013 - 18:05 - 0 comments - 1 attachment
... 315.61 KB In dynamic environments like theWeb, data sources may change not only their ...
Publication - admin - 04/16/2013 - 17:38 - 0 comments - 1 attachment
... for expressing declarative schema mappings, has progressed in the past few years from a research prototype into a technology that is ... depending on the kind of schemas and systems involved in the mapping. Clio currently produces XQuery, XSLT, SQL, and SQL/XML queries. ...
Publication - admin - 04/16/2013 - 13:38 - 0 comments - 1 attachment
... of schema mappings is laborious and time-consuming, even in the presence of tools that facilitate this development. At the same time, ... the adaptation and reuse of the existing schema mappings in the context of the new schemas is an important research problem. In ...
Publication - cat - 04/16/2013 - 12:16 - 0 comments - 0 attachments
... to translate data from one representation to another. In dynamic environments like the Web, data sources may change not only ... query capabilities. Such changes must be reflected in the mappings. Mappings left inconsistent by a schema change have to be ...
Publication - cat - 04/16/2013 - 10:49 - 0 comments - 1 attachment
... of heterogeneous data transformation and integration. In Clio, we have collected together a powerful set of data management techniques that have proven invaluable in tackling these difficult problems. In this paper, we present the underlying ...
Publication - massmann - 04/16/2013 - 10:38 - 0 comments - 1 attachment
... Schemas evolve over time to accommodate the changes in the information they represent. Such evolution causes invalidation of ... depending on the schemas, such as schema mappings. In a heterogenous environment, where cooperation among data sources depends ...
Publication - cat - 04/16/2013 - 09:16 - 0 comments - 1 attachment
... from the schema matching process, that is, the weights and in some cases the directions that are associated with the correspondences. In this paper, we propose a more automatic approach to schema integration that ...
Publication - cat - 04/16/2013 - 04:16 - 0 comments - 1 attachment
... data, thus offering a way to deal with the heterogeneity in the sources. In this paper, we develop a method and a design tool that provide: 1) ...
Publication - cat - 04/16/2013 - 04:05 - 0 comments - 1 attachment
... We now use Clio as part of a broader data-flow framework in which mappings are just one component. These data-flows express complex ... we try to create and run these mapping-based data-flows. In particular, we describe how we use Unified Famous Objects (UFOs), a schema ...
Publication - cat - 04/15/2013 - 22:49 - 0 comments - 0 attachments
