Conclusion
This chapter has presented a variety of concepts pertaining to mapping between XML and relational data. Facilities for accomplishing this mapping are provided by the database vendors and by third-party software manufacturers (either XML specialty vendors or XML-based middleware vendors); in some cases they may be written directly in stored procedures or applications. Vendors, especially database vendors, will also provide facilities for executing XQuery, WebDAV, or other XML processing models directly on top of the relational data model, bypassing translation at the data level.
Which actual features are required for mapping between XML and relational data depends on both the application and on the (possibly evolving) XML schema of ...
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