[Solr Wiki] Update of "SolrFacetingOverview" by ChristianGrobmeier

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The "SolrFacetingOverview" page has been changed by ChristianGrobmeier:
https://wiki.apache.org/solr/SolrFacetingOverview?action=diff&rev1=24&rev2=25

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  = What is Faceted Search =
  From the user perspective, faceted search (also called faceted navigation, guided navigation, or parametric search; Microsoft calls them "Refiners") breaks up search results into multiple categories, typically showing counts for each, and allows the user to "drill down" or further restrict their search results based on those facets.
  
- Solr provides a [[http://wiki.apache.org/solr/SimpleFacetParameters|faceting component]] which is part of the standard request handler and can also be used by various other request handlers to include "Facet counts" based on some simple criteria. [[http://www.lucidimagination.com/Community/Hear-from-the-Experts/Articles/Faceted-Search-Solr|Faceted Search with Solr]] article provides a good introduction to how faceting works with Solr.
+ Solr provides a [[http://wiki.apache.org/solr/SimpleFacetParameters|faceting component]] which is part of the standard request handler and can also be used by various other request handlers to include "Facet counts" based on some simple criteria. 
  
  This page briefly provides some general background information: