Upgrading a Deployed Solution
One of the problems SharePoint developers encountered in past versions of the product is that it was difficult to update solutions once they had been deployed to the farm. If a feature deploys elements like content types or list instances when it is activated, how do these get updated if they are altered in a later version? In 2010, SharePoint introduced a new set of configuration options designed to make these upgrades, if not exactly easy, at least manageable.
Feature Versioning
The key to upgrading a solution package successfully is a new technique called feature versioning. Each feature in a solution file has an associated feature.xml file. This file identifies all of the parameters and components of the feature. ...
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