Introduction
There were 2 main XML parsing technologies few years ago. They were SAX and DOM.

SAX is event-driven and the events are fired and forget along the xml parsing. Advantages: It doesn’t need to cache the whole xml document in memory and you don’t need to wait til the whole xml been parsed before the first [...]

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Introduction of Solr
Solr is a standalone enterprise search server with a web-services like API. You put documents in it (called "indexing") via XML over HTTP (RESTful). You query it via HTTP GET and receive XML results.

Advanced Full-Text Search Capabilities
Optimized for High Volume Web Traffic
Standards Based Open Interfaces - XML and HTTP
Comprehensive HTML Administration Interfaces
Scalability [...]

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Introduction of Lucene
I have heard of Lucene and its powerful full text search capability many times. Today, I decide to take a look at it. Before I dive into the user guide, I went to Google Tech Talk to find a video related to Lucene first. Here is what I found: 

After I finished this video, [...]

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