Once you switch focus from content to process, agile techniques don’t stand a chance. Agile in a ‘content’ perspective leads to the Baconian ‘A man that starts with doubts shall end in certainties’; … These two positions are polar opposites
To summarize, implementing a BI solution by using EDA and SOA is superior to using traditional ETL. Not only do we get our basic BI, but we actually get better, real-time BI—not to mention improvement in the overall quality of our SOA.
ETags are used in conjunction with the “If-None-Match” header on a GET request to take advantage of the browser cache. Because the server generated the ETag in the first place, it can use it later to determine if the page has changed.