On the previous Drupal Jam in Enschede we presented the Opinion Miner. Opinion Miner is a tool that crawls the internet for articles and extracts sentiment information from these articles. This can be very useful for many applications. For example in the field of market research, you can determine the sentiment of all reactions/comments on a article about a hotel. With this sentiment analysis you are able to determine an overall rating of this hotel.
The engine that extracts the sentiments from an article, also developed by Byelex Multimedia, is called OpenDover. OpenDover is a publicly available webservice that extracts the sentiment from articles.
You can now download the OpenDover module from the OpenDover website, to plug into your Drupal website and let the OpenDover module extract the sentiments from the nodes that you posted.
OpenDover works via a webservice, when you saved a node the content of the node will be sent to the OpenDover webservice. OpenDover webservice will scan the content and will return a RDF document to the OpenDover module. The OpenDover module parses this RDF document and will store the sentiments in your database. The sentiments will also be shown when you view the node.
More information about how to setup the OpenDover module can be found on the OpenDover website.
The Drupal module is the first module that will work with OpenDover, but because we use a REST protocol for communication and the RDF document format for communication other systems will be able to work with OpenDover as well. We will provide more detailed information about how to do this in the future, till then you could try to use the Drupal module as a guide.
We will create a project page on Drupal.org as soon as possible such that you can post your issues there. In the meantime you can leave comments/questions/remarks here and we will move them to the Drupal.org issue queue whenever it is set up.
Hi, could you provide some explanation on how this relates to OpenCalais?
And could you please make the presentation downloadable from Slideshare. It should be an option since I can download some other presentations.
The presentation has been on Slideshare since shortly after DrupalJam IV. It can be found here... http://www.slideshare.net/igmelig/opinion-miner-online-sentiment-analysi...
OpenCalais is a webservice by Reuters that takes an article and tags it with words from categories like city, region, product, holiday, etcetera
OpenDover is a webservice created by us from Byelex and Internet Unlimited that takes an article and a set of base tags. The webservice will then tag the article for each base tag that you sent to the service. It will tag the article with the sentiment for each base tag. Based on all the scores in the article it is possible to calculate a sentiment of the article and of each base tag.
So the only relation between opencalais and opendover is that it is a webservice that tags articles (and a little bit the name).
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