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Examine is a provider based, config driven search and indexer framework. Examine provides all the methods required for indexing and searching any data source you want to use. It is agnostic of the indexer/ searcher API, as well as the data source. It's provider model driven so indexers and searchers for any type of data can be plugged in.
Using Examine to index and search with ANY data source.
Examine slide deck for CodeGarden 2010
Examine demo site source code from Codegarden 2010