The parse-metatags plugin consists of a HTMLParserFilter which takes as parameter a list of metatag names with '*' as default value. The values are separated by ';'.
In order to extract the values of the metatags description and keywords, you must specify in nutch-site.xml
The MetatagIndexer uses the output of the parsing above to create two fields 'keywords' and 'description'. Note that keywords is multivalued.
The query-basic plugin is used to include these fields in the search e.g. in nutch-site.xml
This code has been developed by DigitalPebble Ltd and offered to the community by ANT.com