Temporal Slicing in the Evaluation of XML Queries

Gao, Dengfeng; Snodgrass, Richard T.

doi:10.1016/b978-012722442-8/50062-8

Cited by 65 publications

(38 citation statements)

References 5 publications

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“…With respect to their query classification, in our work we support current and sequenced temporal queries. Furthermore, we not only implemented our temporal query processor by leveraging existing XQuery engines, as suggested in [17], but also by exploiting the potentialities of a relational DBMS query engine. As shown in Sec.…”

Section: Related Work and Discussionmentioning

confidence: 99%

“…To this purpose, temporal support is required at query level. From a technical point of view, the reconstruction of temporally consistent document version(s), corresponds to a timeslicing operation: in particular, the reconstruction of all the consolidated versions qualifying for a given (multidimensional) time period corresponds to the execution of sequenced queries in [17], that is queries applied independently at each point in time in order to return a consistent history.…”

Section: Querying Normative Documentsmentioning

confidence: 99%

“…The paper [17] presents a temporal XML query language, τ XQuery, with which the authors add temporal support to XQuery by extending its syntax and semantics. The temporal support concerns the valid time dimension and three kinds of temporal queries are considered: current, sequenced, and representational.…”

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confidence: 99%

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Temporal modelling and management of normative documents in XML format

Grandi

Mandreoli

Tiberio

2005

Data & Knowledge Engineering

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In this paper, we present the results of a research project concerning the temporal management of normative texts in XML format. In particular, four temporal dimensions (publication, validity, efficacy and transaction times) are used to correctly represent the evolution of norms in time and their resulting versioning. Hence, we introduce a multiversion data model based on XML schema and define basic mechanisms for the maintenance and retrieval of multiversion norm texts. Finally, we describe a prototype management system which has been implemented and evaluated.

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Section: Related Work and Discussionmentioning

confidence: 99%

Section: Querying Normative Documentsmentioning

confidence: 99%

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Temporal modelling and management of normative documents in XML format

Grandi

Mandreoli

Tiberio

2005

Data & Knowledge Engineering

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“…The idea of maximally-fragmented slicing is similar to that used to define the semantics of τ XQuery queries [19], which adapted the idea of constant periods originally introduced to evaluate (sequenced) temporal aggregates [20].…”

Section: Maximally-fragmented Slicingmentioning

confidence: 99%

Temporal Support for Persistent Stored Modules

Snodgrass

Gao

Zhang

et al. 2012

2012 IEEE 28th International Conference on Data Engineering

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Abstract-We show how to extend temporal support of SQL to the Turing-complete portion of SQL, that of persistent stored modules (PSM). Our approach requires minor new syntax beyond that already in SQL/Temporal to define and to invoke PSM procedures and functions, thereby extending the current, sequenced, and non-sequenced semantics of queries to such routines. Temporal upward compatibility (existing applications work as before when one or more tables are rendered temporal) is ensured. We provide a transformation that converts Temporal SQL/PSM to conventional SQL/PSM. To support sequenced evaluation of stored functions and procedures, we define two different slicing approaches, maximal slicing and per-statement slicing. We compare these approaches empirically using a comprehensive benchmark and provide a heuristic for choosing between them.

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“…Keeping the history in a document or data collection is useful because it provides the ability to recover past versions, track changes over time, and evaluate temporal queries [17]. But it changes the nature of validating against a schema.…”

Section: Motivating Examplementioning

confidence: 99%

A Tale of Two Schemas: Creating a Temporal XML Schema from a Snapshot Schema with τXSchema

Currim

Dyreson

et al. 2004

Lecture Notes in Computer Science

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Abstract. The W3C XML Schema recommendation defines the structure and data types for XML documents. XML Schema lacks explicit support for timevarying XML documents. Users have to resort to ad hoc, non-standard mechanisms to create schemas for time-varying XML documents. This paper presents a data model and architecture, called τXSchema, for creating a temporal schema from a non-temporal (snapshot) schema, a temporal annotation, and a physical annotation. The annotations specify which portion(s) of an XML document can vary over time, how the document can change, and where timestamps should be placed. The advantage of using annotations to denote the time-varying aspects is that logical and physical data independence for temporal schemas can be achieved while remaining fully compatible with both existing XML Schema documents and the XML Schema recommendation.

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Temporal Slicing in the Evaluation of XML Queries

Cited by 65 publications

References 5 publications

Temporal modelling and management of normative documents in XML format

Temporal modelling and management of normative documents in XML format

Temporal Support for Persistent Stored Modules

A Tale of Two Schemas: Creating a Temporal XML Schema from a Snapshot Schema with τXSchema

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