Freie Universität Berlin, Fachbereich Mathematik und Informatik : Ser. B, Informatik ; 99,09
004 Data processing and Computer science
In this report a framework for building “virtual” web sites using the HyperView system is
presented. Virtual web sites are web sites that offer information extracted and integrated from
other web sites on the fly. The HyperView system already supports the demand-driven integration
of information from different semistructured information sources into a graph database.
The problem we are dealing with here is to query the database and generate HTML pages
from the results as a response to HTTP requests received from the user. The returned HTML
pages should hide the aspects of data extraction and integration and should give the user the
impression of a single, coherent web site.
We show first how HyperViews comprised of graph-transformation rules can be defined
that generate HTML pages from the database. This way web sites for individual application
schemata can be designed. In the second part we present a generic rule set that defines a web
interface for HyperView graph databases with arbitrary schemata. This generic web interface
can be customized for the particular application by annotating the database schema and chosing
The work presented in this report completes the HyperView approach in the sense that it
closes the circle of extracting and integrating information from the web by again publishing
the integrated data on the web. Our approach applies as well to the integration and generation
of XML documents on the web.
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