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Apache Solr 3 Enterprise Search Server by Eric Pugh, David Smiley

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Hierarchical faceting

Imagine if your documents have some sort of taxonomy or other hierarchical label. This might be a file path or URL path. It could be a geographic location organized by continent, country, state/province, and then city. Or it might be a large company's organizational hierarchy for employees. A faceted navigation experience for such data might be a tree browser common in file navigation with an added facet count at each node.

Hierarchical faceting

The preceding screenshot is from Amazon, which has a simple hierarchical interface easily implemented with Solr.

Note

Solr does not directly feature hierarchical faceting but it has the underlying capabilities ...

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