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The "WritingPluginExample" page has been changed by LewisJohnMcgibbney: http://wiki.apache.org/nutch/WritingPluginExample?action=diff&rev1=16&rev2=17 <meta name="recommended" content="plugins" /> }}} - In order to do this we need to write a plugin that extends 3 different extension points. We need to extend the HTMLParser (which in turn extends the [[http://nutch.apache.org/apidocs-1.3/org/apache/nutch/parse/Parser.html|Parser]] class) in order to get the recommended terms out of the meta tags. The [[http://nutch.apache.org/apidocs-1.3/org/apache/nutch/indexer/IndexingFilter.html|IndexingFilter]] will need to be extended to add a recommended field to the index. Finally we need to add the new field to our Nutch schema.xml which will add the ability to search against the new field in the index. + In order to do this we need to write a plugin that extends 2 different extension points. Firstly we need to extend the [[http://nutch.apache.org/apidocs-1.3/org/apache/nutch/indexer/IndexingFilter.html|IndexingFilter]] by creating an URLMetaIndexingFilter as we need to add any additional meta-tags to the index. Secondly we need to extend the [[http://nutch.apache.org/apidocs-1.3/org/apache/nutch/scoring/ScoringFilter.html|ScoringFilter]] by creating an URLMetaScoringFilter. The idea here is that this will take the metatags we have listed in our "urlmeta.tags" property, and looks for them inside the parseData object. This allows us to match recommended terms out of the meta tags. If there was no property within nutch-default.xml for us to specify these terms we would be required to add the new field to our Nutch schema.xml which would also add the ability to search against the new field in the index. == Setup == Start by [[http://svn.apache.org/repos/asf/nutch/tags/release-1.3/|downloading]] the Nutch-1.3 source code. Once you've got that make sure it compiles as is before you decide to make any changes. You should be able to get it to compile by running ant from the directory you downloaded the source to. If you have trouble you can write to one of the [[Mailing|Mailing Lists]].
