[PDF][PDF] Formal models of web queries
AO Mendelzon, T Milo - Proceedings of the sixteenth ACM SIGACT …, 1997 - dl.acm.org
AO Mendelzon, T Milo
Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on …, 1997•dl.acm.orgThe paper presents a new model of query and computation on the Web. We focus on two
important aspects that distinguish the access to Web data from the access to a standard
database system: the navigational nature of the access and the lack of concurrency control.
We show that these two issues have significant effect, on the computability of queries. To
illustrate the ideas and how they can be used in practice for designing appropriate Web
query languages, we consider a particular query language, the Web calculus, an abstraction …
important aspects that distinguish the access to Web data from the access to a standard
database system: the navigational nature of the access and the lack of concurrency control.
We show that these two issues have significant effect, on the computability of queries. To
illustrate the ideas and how they can be used in practice for designing appropriate Web
query languages, we consider a particular query language, the Web calculus, an abstraction …
Abstract
The paper presents a new model of query and computation on the Web. We focus on two important aspects that distinguish the access to Web data from the access to a standard database system: the navigational nature of the access and the lack of concurrency control. We show that these two issues have significant effect, on the computability of queries. To illustrate the ideas and how they can be used in practice for designing appropriate Web query languages, we consider a particular query language, the Web calculus, an abstraction and extension of the practical Web query language Webs&L.
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