Creating Taxonomies 
Documents are assigned to categories in a taxonomy. Each category only contains documents that have similar contents or that are related to the same topic. The categories in a taxonomy form a hierarchical ordering of terms.
Prerequisites
You always have to create an index first, regardless of whether the taxonomy is to be query-based or example-based. The index to be created can be a classification index or a combined search and classification index.
Procedure
Creating Query-Based Taxonomies
You create a query-based taxonomy in order to be able to classify documents on the basis of search queries. For more information, see Creating a Query-Based Taxonomy.
Creating Example-Based Taxonomies
You create an example-based taxonomy to be able to classify documents on the basis of example documents. For more information, see Creating an Example-Based Taxonomy.