With the field capabilities of freeWAIS-sf it became difficult to query more than one database in parallel. The set of searchable fields can differ for different databases, they may have heterogeneous schemas. An important concept in database systems is data independence. Based on this concept a unifying view on multiple freeWAIS-sf databases is presented: the aspect of heterogeneity of different databases is hidden from the user. SFgate is a gateway between the World Wide Web and freeWAIS-sf which implements this approach.
| Identifer | oai:union.ndltd.org:DUETT/oai:DUETT:duett-04232004-113208 |
| Date | 23 April 2004 |
| Creators | Goevert, Norbert |
| Contributors | none |
| Publisher | Gerhard-Mercator-Universitaet Duisburg |
| Source Sets | Dissertations and other Documents of the Gerhard-Mercator-University Duisburg |
| Language | German |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-04232004-113208/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. Hiermit erteile ich der Universitaet Duisburg das nicht-ausschliessliche Recht unter den unten angegebenen Bedingungen, meine Dissertation, Staatsexamens- oder Diplomarbeit, meinen Forschungs- oder Projektbericht zu veroeffentlichen und zu archivieren. Ich behalte das Urheberrecht und das Recht das Dokument zu veroeffentlichen und in anderen Arbeiten weiterzuverwenden. |
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