S. Abiteboul. On views and xml. In Proc. ACM Symp. on Principles of Database System, pages 1--9, 1999.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....and provide for the systematic import and or export of XML data. As in traditional databases, users often need to view data from different perspectives. XML views are able to offer a structured interface over semistructured data and make it possible to integrate heterogeneous data source [A99]. Several systems such as ActiveViews [AAC 99] and MIX [BGL 99] have been developed to support XML views. The ActiveViews system defines views using the object oriented model. MIX system integrates heterogeneous data sources and offers views based on the underlying data sources. While both ....

. S. Abiteboul. On Views and XML. In Proceedings of the Eighteenth ACM Symposium on Principles of Database Systems, pages 1--9. ACM Press, 1999.

....operations for creating XML views, namely, selection, projection, join and swap operation. Finally, we develop a comprehensive algorithm that checks for the validity of XML views constructed by applying the four operations. 1 Introduction It is necessary to provide for XML views [1]. Several systems have been proposed to support XML views, including Active Views [2] and MIX [5] While both systems provide for the definition of XML views, they do not validate the views that are created. Therefore, there is no guarantee that the views defined are valid. In this paper, we ....

S. Abiteboul. On views and XML. In Proceedings of the Eighteenth ACM Symposium on Principles of Database Systems, ACM Press, pages 1-9, 1999.

....engineering in todays Web based computing environment where vast amount of heterogeneous information proliferates every day. Since XML emerged as a standard for Web documents, many research issues in XML data management have been investigated. The view concept is also useful for XML data [2][4] 5] For the frequently submitted query against XML documents, its expression can be defined as an XML view for later convenient and efficient reuse. For example, the frequently accessed portions out of huge collection of XML documents in the XML warehouse could be defined as views and possibly ....

# S. Abiteboul, "On Views and XML," Proc. ACM Symp. on Principles of Database System, 1999, pp. 1-9.

....In OEM, an XML document is represented as a graph with a single root. The nodes represent the element contents while the edges represent the element names, with leaves holding character data. Attribute values are given on corresponding nodes, and attribute references are depicted as dashed lines [2]. In order for OEM to model MXML documents we have to adapt it so as to represent elements and attributes whose contents vary according to dimension values. For this, we extend OEM by introducing another type of node edge pair, which is represented by a thick line departing from a square. The ....

Serge Abiteboul. On views and XML. In Proceedings of the 18th ACM SIGACTSIGMOD -SIGART Symposium on Principles of Data Base Systems, pages 1-9. ACM Press, 1999.

....out in [12] This paper constitutes a first step in trying to validate and apply this framework empirically. The problem of content evolution with respect to materialized views (which may be viewed as a complex form of data transcription) in databases has already been recognized. For example, in [1], the incompleteness of data in views was noted as being a dynamic notion since data may be constantly added removed from the view. Yet, we believe that there has been no prior formal modeling of the evolution process. 4 Related research involves the containment property of a materialized view ....

S. Abiteboul. On views and XML. In Proceedings of the

....of this paper is in developing a formal framework for modeling content evolution in relational databases. The problem of content evolution with respect to materialized views (which may be regarded as a complex form of data transcription) in databases has already been recognized. For example, in [1], the incompleteness of data in views was noted as being a dynamic notion since data may be constantly added removed from the view. Yet, we believe that there has been no prior formal modeling of the evolution process. 3 Related research involves the containment property of a materialized view ....

S. Abiteboul. On views and XML. In Proceedings of the

....visualizations. Our motivation stems from our belief, that XML and its sister standards are the true inheritors of the nested relational data model. However, we will not go into the debate whether it makes sense to double database capabilities, like generating views and querying data in XML [1, 3]. Rather, we just present examples and methods for the obvious mappings and continue to the not so obvious questions of meta schema and meta visualizations, since schemas and style sheets are XML documents in their own right. 2 What s in a Document Instead of going into an abstract debate about ....

Serge Abiteboul. On Views and XML, SIGMOD Record, Vol. 28, No. 4, Dec. 1999, pp. 3038.

....system. Path expressions and recursive queries should be available. Quings represent a kind of view. Therefore a discussion of views in other models systems is necessary, for example views in relational database systems ( 9] object views in the Garlic project ( 12] or views for XML ([3]) Another interesting aspect is the restructuring of data. For example, searching for exercises in a virtual course results in a set of pages in which only the data relating to exercises are listed, the rest is removed from the original page. The expressiveness of the Quing query model has ....

S. Abiteboul. On Views and XML. In Proc. ACM Symp. on Principles of Database Systems, pages 1--9, 1999.

....with null values from entries representing a group as a whole [3] Next, 11] is, to our knowledge, the first paper addressing the issue of using conditional tables for representing and maintaining materialized views, which can potentially be used in the context of data warehousing. Finally, [1] emphasized the potential use of conditional tables for incomplete databases and in applications such as electronic commerce. However, there is no reported work on aggregate queries over conditional tables yet. The remainder of this paper is organized as follows. In Section 2 we introduce the ....

....to each group. A sample representation for Table 3 is shown in Table 6. Again, the number of tuples in the resulting representation is bounded by the number of tuples in the original table. Table 6: Interval representation of 798; A (assuming ) A D [1,4] 1 [1,7] 3,12] 6 Conclusions In this paper, we have extended the theory of conditional tables with the definition of aggregate queries. This has been done carefully, so that we have been able to present a strong representation system with the desirable closure property that the ....

[Article contains additional citation context not shown here]

S. Abiteboul. On views and XML. In Proc. 18th ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, pages 1--9, Philadelphia, Pensylvania, USA, 1999. 15

....We could use a language like XML QL for this purpose. However, due to the lack of a standard query language for XML, we currently use XSLT in the HERA software to express the different transformation of the data (in XML) This research is related to work on view specifications for XML data [1]. The main difference is that in HERA the query transformations are influenced by a number of practical issues, e.g. general or domain dependent heuristics. QUERY RESULT TRANSFORMATION The generation process starts from XML data that represent the query result, and eventually transforms them ....

Abiteboul, S. On Views and XML, SIGMOD Record, 28, 4 (1999), 30-38.

....structure and the conceptual document structure of knowledge modules in an application specific way which is needed in composition, navigation and adaptation. The latter also profits from the new concept of view specifications which specify transformations on semi structured knowledge modules [1]. Our approach does not depend on a relational or object oriented modeling of an entire topic itself and thus avoids the huge effort needed in conceptually modeling an academic web site [11] electronic product catalogues [6] the domain of multimedia [18] or programming languages [10] The rest ....

S. Abiteboul. On Views and XML. SIGMOD Record, Vol. 28, No. 4, 1999/12.

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S. Abiteboul. On views and xml. In Proc. ACM Symp. on Principles of Database System, pages 1--9, 1999.

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Abiteboul, S.: On views and XML. In: Proceedings of the 18th ACM SIGPLANSIGACT symposium on Principles of Database Systems, ACM Press (1999) 1--9

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Serge Abiteboul, "On Views and XML", ACM SIGMOD Record, Vol. 28, No. 4, pp. 30--38, December 1999.

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Serge Abiteboul, "On Views and XML", Proc. of 18th ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS '99), Philadelphia (June 1999.

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Serge Abiteboul. On Views and XML. In Proc. ACM Symp. Principles Database Systems, 1999.

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S.Abiteboul. On Views and XML. Proc. of PODSC onf., 1999, 1-9

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S. Abiteboul. On views and XML. In Proceedings of the 18th ACM SIGPLANSIGACT -SIGART Symposium on Principles of Database Systems, pages 1--9. ACM Press, 1999.

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S. Abiteboul. On views and XML. In Proceedings of the 18th ACM SIGPLAN-SIGACTSIGART Symposium on Principles of Database Systems, pages 1--9. ACM Press, 1999.

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Serge Abiteboul, "On Views and XML", ACM SIGMOD Record, Vol. 28, No. 4, pp. 30--38, December 1999.

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Serge Abiteboul, "On Views and XML", Proc. of 18th ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS '99), Philadelphia (June 1999.

No context found.

Serge Abiteboul. On views and XML. In Proceedings of the 18th ACM SIGPLAN-SIGACT symposium on Principles of Database Systems, pages 1--9. ACM Press, 1999.

No context found.

S. Abiteboul. On views and XML. In Proceedings of the 18th ACM SIGPLANSIGACT -SIGART Symposium on Principles of Database Systems, pages 1--9. ACM Press, 1999.

No context found.

S.Abiteboul. On Views and XML. Proc. of PODS Conf., 1999, 1-9

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Serge Abiteboul. On views and XML. In Proceedings of the 18th ACM SIGPLAN-SIGACT symposium on Principles of Database Systems, pages 1--9. ACM Press, 1999.

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