Mapping Maintenance in XML P2P Databases
نویسندگان
چکیده
Unstructured p2p database systems are usually characterized by the presence of schema mappings among peers. In these systems, the detection of corrupted mappings is a key problem. A corrupted mapping fails in matching the target or the source schema, hence it is not able to transform data conforming to a schema Si into data conforming to a schema Sj , nor it can be used for effective query reformulation. This paper describes a novel technique for maintaining mappings in XML p2p databases, based on a semantic notion of mapping correctness.
منابع مشابه
HepToX: Heterogeneous Peer to Peer XML Databases
We study a collection of heterogeneous XML databases maintaining similar and related information, exchanging data via a peer to peer overlay network. In this setting, a mediated global schema is unrealistic. Yet, users/applications wish to query the databases via one peer using its schema. We have recently developed HepToX, a P2P Heterogeneous XML database system. A key idea is that whenever a ...
متن کاملHePToX: Marrying XML and Heterogeneity in Your P2P Databases
We present HePToX, a full-fledged peer-topeer database system that efficiently handles XML data heterogeneity. In a highly dynamic P2P network, it is unrealistic for a peer entering the network to be forced to agree on a global mediated schema, or to perform heavyweight operations for mapping its schema to neighboring schemas. In our demo, we show that to enter the HePToX network a peer user is...
متن کاملXlPPX: A Lightweight Framework for Privacy Preserving P2P XML Databases in Very Large Publish-Subscribe Systems
The problem of supporting privacy preservation of XML databases within very large publish-subscribe systems is rapidly gaining interest for both academic and industrial research. It becomes even more challenging when XML data are managed and delivered according to the P2P paradigm, since malicious accesses and unpredictable attacks could take advantage from the totally-decentralized and untrust...
متن کاملSchema Mapping and Query Translation in Heterogeneous Peer-to-Peer XML Databases
In a peer-to-peer data management system, the peers may have heterogeneous schemas, and no mediated global schema. To facilitate data exchange, we assume each entering peer provides correspondences between its schema and a small number of other peer schemas. We study the problem of schema mapping and query translation in the context of heterogeneous XML schemas, featuring data/schema conflict. ...
متن کاملTypechecking Queries for Maintaining Schema Mappings in XML P 2 P Databases ∗
Peer data management systems (PDMSs) for XML data allow the user to easily share and query XML data dispersed over multitudes of sites without the complex and heavy administrative tasks that characterize traditional distributed database systems. Most of them are based on a common model, where nodes in the system are connected through sparse point-to-point mappings, and queries are executed with...
متن کامل