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>So you are replacing SQL calls with WebDAV? Can you explain this a bit >further? Hi, No, WebDAV is, among other things, an XML representation of a folder structure, and we were using SQL to help build the XML needed for WebDAV support, not replacing one with the other. Voyager stores normalized call numbers in a table, and SQL was used to pull out records before transforming the results to the XML layout required. In Windows, WebDAV is accessed as a "web folder", and the result was to expose the library catalogue as a series of nested folders in call number order. My big interest was to make the catalogue an extension of the desktop, and open up the possibility of using desktop indexers for catalogue content. There is more information in a submission Ross and I did for the Talis mashup competition: http://librarycog.uwindsor.ca/indexcat We were able to use caching to minimize the overhead of the SQL queries, but a better method would be to work directly with MARC files since there wouldn't be a Voyager dependency, and the approach would be open to any system that can export the catalogue. art