XQBE (XQuery By Example): A Visual Interface to the Standard XML Query Language.

  • Braga D
  • Campi A
  • Ceri S
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The spreading of XML data in many contexts of modern computing infrastructures and systems causes a pressing need for adequate XML querying capabilities; to address this need, the W3C is proposing XQuery as the standard query language for XML, with a language paradigm and a syntactic flavor comparable to the SQL relational language. XQuery is designed for meeting the requirements of skilled database programmers; its inherent complexity makes the new language unsuited to unskilled users. In this article we present XQBE (XQuery By Example), a visual query language for expressing a large subset of XQuery in a visual form. In designing XQBE, we targeted both unskilled users and expert users wishing to speed up the construction of their queries; we have been inspired by QBE, a relational language initially proposed as an alternative to SQL, which is supported by Microsoft Access. QBE is extremely successful among users who are not computer professionals and do not understand the subtleties

Author-supplied keywords

  • DATABASE management
  • Human interfaces
  • INFORMATION storage & retrieval systems
  • PL/SQL (Computer program language)
  • QUERY languages (Computer science)
  • RELATIONAL databases
  • XML
  • XML (Document markup language)
  • XQuery
  • semi-structured data
  • visual query languages

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  • Daniele Braga

  • Alessandro Campi

  • Stefano Ceri

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