Review - Relational Databases for Querying XML Documents: Limitations and Opportunities.

Micah Tessler: Review - Relational Databases for Querying XML Documents: Limitations and Opportunities. ACM SIGMOD Digital Review 2: (2000) BibTeX

Review

The authors' method for converting XML documents to relational tables for the purposes of querying data simplifies many questions regarding XML querying. It allows XML queries to use the 20 yrs of research in querying relational tables. The methods correctly returned results in all 37 test documents. There are some weaknesses with the methods, though. Some meaning is lost when converting from XML to relational tables. The authors note this and propose some additions to SQL that would improve relational modelling of XML documents. The overhead of converting between relational tables and XML documents is significant. Every method proposed by the authors for conversion to relational tables involves redundant data. In addition, the entire document must be converted to relational tables before it can be queried. The conversion between relational tables and XML could be a large bottleneck for complex queries. However, SQL query engines are more advanced than XML query engines at this point, and the time expended to convert to relational tables may be made up for in the time to query with an XML search engine.

References

[1]: Jayavel Shanmugasundaram, Kristin Tufte, Chun Zhang, Gang He, David J. DeWitt, Jeffrey F. Naughton: Relational Databases for Querying XML Documents: Limitations and Opportunities. VLDB 1999: 302-314 BibTeX

BibTeX

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