Schema Evolution publication categorizer

... data exchange have become popular and useful tools both in research and industry. A schema mapping relates a source schema with a ... be used to materialize data at the target or used as views in a virtually integrated system. We present a classification of mapping ...

Publication - cat - 04/17/2013 - 03:27 - 0 comments - 1 attachment

... 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

... 180 KB In order to formulate a meaningful XML query, a user must have some knowledge ... assumed by the user, thus causing the query to fail. In this paper, we try to solve this query and data schema mismatching problem ...

Publication - huliganka - 04/16/2013 - 23:49 - 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

... between database schemas. Schema mappings are prominent in several different areas of database management, including database design, ... and peer-to-peer data management systems. Our main aim in this paper is to present an overview of recent advances in data exchange and ...

Publication - cat - 04/16/2013 - 21:27 - 0 comments - 1 attachment

... that the input document may be preprocessed, which in certain situations, may be computationally and memory intensive. In this paper, we describe how knowledge of conformance to an XML Schema (or ...

Publication - huliganka - 04/16/2013 - 21:06 - 0 comments - 1 attachment

... 250.47 KB In this paper we motivate and describe materialized views, their applications, ... describe some of the view maintenance techniques proposed in the literature in terms of our taxonomy. Finally, we consider new and promising application ...

Publication - cat - 04/16/2013 - 16:05 - 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

... 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

... 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