[Nutch Wiki] Update of "WritingPluginExample-0.9" by JasperKamperman

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The following page has been changed by JasperKamperman:
http://wiki.apache.org/nutch/WritingPluginExample-0%2e9

The comment on the change is:
Added explanation why the field is added as UN_TOKENIZED

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  == The Example ==
  
- Consider this as a plugin example: We want to be able to recommend specific web pages for given search terms.  For this example we'll assume we're indexing this site.  As you may have noticed, there are a number of pages that talk about plugins.  What we want to do is have it so that if someone searches for the term "plugin" we recommend that they start at the PluginCentral page, but we also want to return all the normal hits in the expected ranking.  We'll seperate the search results page into a section of recommendations and then a section with the normal search results.
+ Consider this as a plugin example: We want to be able to recommend specific web pages for given search terms.  For this example we'll assume we're indexing this site.  As you may have noticed, there are a number of pages that talk about plugins.  What we want to do is have it so that if someone searches for the term "plugins" we recommend that they start at the PluginCentral page, but we also want to return all the normal hits in the expected ranking.  We'll seperate the search results page into a section of recommendations and then a section with the normal search results.
  
  You go through your site and add meta-tags to pages that list what terms they should be recommended for.  The tags look something like this:
  
@@ -177, +177 @@

  
  == The Indexer Extension ==
  
- The following is the code for the Indexing Filter extension.  If the document being indexed had a recommended meta tag this extension adds a lucene text field to the index called "recommended" with the content of that meta tag.  Create a file called RecommendedIndexer.java in the source code directory:
+ The following is the code for the Indexing Filter extension.  If the document being indexed had a recommended meta tag this extension adds a lucene text field to the index called "recommended" with the content of that meta tag. Create a file called RecommendedIndexer.java in the source code directory:
  
  {{{
  package org.apache.nutch.parse.recommended;
@@ -242, +242 @@

    }  
  }
  }}}
+ 
+ Note that the field is UN_TOKENIZED because we don't want the recommended tag to be cut up by a tokenizer. Change to TOKENIZED if you want to be able to search on parts of the tag, for example to put multiple recommended terms in one tag.  
  
  == The QueryFilter ==