... 295.69 KB With the wider use of ontologies in the Semantic Web and as part of production systems, multiple scenarios for ... the new versions serendipitously; ontology-development in a collaborative environment can be synchronous or asynchronous; managers of ...
Publication - hartung - 04/17/2013 - 00:49 - 0 comments - 1 attachment
... Multiversion support for XML documents is needed in many critical applications, such as software configuration control, ... warehouses, and ”e-permanence” of web documents. In this paper, we introduce efficient and robust techniques for: (i) storing ...
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
... Venue: In Proceedings of the Symposium on Principles of Database Systems (PODS), pages ... have recently been investigated for relational data.In this paper, we start looking into the basic properties of XML data exchange, ...
Publication - hartung - 04/16/2013 - 22:16 - 0 comments - 1 attachment
... capability of uniform manipulation of data and meta-data in relational multi-database systems. We develop a precise syntax and semantics of SchemaSQL in a manner that extends traditional SQL syntax and semantics, and ...
Publication - cat - 04/16/2013 - 18:05 - 0 comments - 1 attachment
... Semantic mappings between data sources play a key role in several data sharing architectures. Mappings provide the relationships between data stored in different sources, and therefore enable answering queries that require ...
Publication - admin - 04/16/2013 - 17:49 - 0 comments - 1 attachment
... 122.04 KB Researchers in the ontology-design field have developed the content for ontologies in many domain areas. Recently, ontologies have become increasingly common on ... WorldWide Web where they provide semantics for annotations in Web pages. This distributed nature of ontology development has led to a ...
Publication - admin - 04/16/2013 - 17:05 - 0 comments - 1 attachment
... matches. iMAP reformulates schema matching as a search in an often very large or infinite match space. To search effectively, it ...
Publication - admin - 04/16/2013 - 16:49 - 0 comments - 1 attachment
... (e.g., {author} corresponds to {first name, last name} in the Books domain). We observe that the co-occurrences patterns across query ... (e.g., {first name, last name}) tend to be co-present in query interfaces and thus positively correlated. In contrast, synonym ...
Publication - admin - 04/16/2013 - 16:27 - 0 comments - 1 attachment
... KB We consider the problem of mapping data in peer-topeer data-sharing systems. Such systems often rely on the use of ... of corresponding values to search for data residing in different peers. In this paper, we address semantic and algorithmic issues ...
Publication - Anonymous - 04/16/2013 - 16:05 - 0 comments - 1 attachment
... 1.37 MB One important step in integrating heteroge- neous databases is matching equivalent at- tributes: Determining which fields in two databases refer to the same data. The mean- ing of information may be ... a neural network to recog- nize similar attributes. In our technique, the knowledge of how to match equivalent data elements ...
Publication - admin - 04/16/2013 - 15:38 - 0 comments - 1 attachment
... has now become a prominent area of database research. In this article, we first review database applications that require semantic ... and identify open research issues. We will focus in particular on schema matching, a topic that has received much attention in ...
Publication - admin - 04/16/2013 - 15:38 - 0 comments - 1 attachment
... previous solutions to the schema matching problem rely in some fashion upon identifying "similar" column names in the schemas to be matched, or by recognizing common domains in the data ...
Publication - admin - 04/16/2013 - 15:27 - 0 comments - 1 attachment
... can be used to determine whether a mapping is adequate in a particular context. Finally, we consider an instance of our framework ...
Publication - admin - 04/16/2013 - 15:16 - 0 comments - 1 attachment
... virtual database systems are suitable for environments in which the set of member information sources is small and stable. ... new information sources into the virtual database. In this paper we describe a system, called Autoplex, which uses machine ... the virtual database system by human experts as done in standard virtual database systems . Autoplex learns the features of ...
Publication - admin - 04/16/2013 - 13:49 - 0 comments - 1 attachment
... is the problem of identifying corresponding elements in different schemas. Discovering these correspondences or matches is ... rather poorly due to the lack ofsufficient evidence in the schemas being matched. In this paper we show how a corpus of schemas and mappings can be used to ...
Publication - admin - 04/16/2013 - 13:38 - 0 comments - 1 attachment
... framework we developed for modeling uncertainty in semantic web. In this approach, the source and target ontologies are first translated into ...
Publication - admin - 04/16/2013 - 13:27 - 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
... 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
... complete prototype of a generic modelmanagement system, in which high-level operators are used to manipulate models and mappings ...
Publication - cat - 04/16/2013 - 03:05 - 0 comments - 1 attachment
... Many uses of models involve managing changes in models and transformations of data from one model into another. These uses ... their use. We call this capability model management. In addition to making the case for model management, our main contribution is a ...
Publication - huliganka - 04/16/2013 - 02:49 - 0 comments - 1 attachment
