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      Programming Constructs for Unstructured Data

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      Proceedings of the Fifth International Workshop on Database Programming Languages (DBPL-5)
      Database Programming Languages
      6-8 September 1995
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            Abstract

            We investigate languages for querying and transforming unstructured data by which we mean languages than can be used without knowledge of the structure (schema) of the database. There are two reasons for wanting to do this. First, some data models have emerged in which the schema is either completely absent or only provides weak constraints on the data. Second, it is sometimes convenient, for the purposes of browsing, to query the database without reference to the schema. For example one may want to “grep” all character strings in the database, or one might want to find the information associated with a certain field name no matter where it occurs in the database. This paper introduces a labelled tree model of data and investigates various programming structures for querying and transforming such data. In particular, it considers various restrictions of structural recursion that give rise to well-de ned queries even when the input data contains cycles. It also discusses issues of observable equivalence of such structures.

            Content

            Author and article information

            Conference
            September 1995
            September 1995
            : 1-12
            Affiliations
            [0001]Dept. of Computer and Information Science

            University of Pennsylvania

            Philadelphia, PA 19104
            [0002]AT&T Bell Laboratories

            Murray Hill, NJ 07974, USA
            Article
            10.14236/ewic/DBPL1995.4
            956948be-d39d-491b-a25c-431087a352aa
            © Peter Buneman et al. Published by BCS Learning and Development Ltd. Proceedings of the Fifth International Workshop on Database Programming Languages, Gubbio, Umbria, Italy

            This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

            Proceedings of the Fifth International Workshop on Database Programming Languages
            DBPL-5
            5
            Gubbio, Umbria, Italy
            6-8 September 1995
            Electronic Workshops in Computing (eWiC)
            Database Programming Languages
            Product
            Product Information: 1477-9358BCS Learning & Development
            Self URI (article page): https://www.scienceopen.com/hosted-document?doi=10.14236/ewic/DBPL1995.4
            Self URI (journal page): https://ewic.bcs.org/
            Categories
            Electronic Workshops in Computing

            Applied computer science,Computer science,Security & Cryptology,Graphics & Multimedia design,General computer science,Human-computer-interaction

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