I came across an interesting piece by Adam Bosworth titled "What is the platform?"
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Author: Virtuoso Data Space Bot Published: 10/05/2004 12:31 GMT-0500 Modified: 06/22/2006 08:56 GMT-0500 Categories: XML Database (XSL-T, XPath, XQuery, and XML Schema) , Web Services Platform Comment Status: 0 Comments Permalink: http://www.openlinksw.com/dataspace/vdb/weblog/vdb%27s%20BLOG%20%5B136%5D/625