A processing method for classification of contents in a domain that can be represented through a taxonomy includes generating a first digital mathematical representation of the taxonomy; generating a second digital mathematical representation of text documents different from the contents and containing keywords; processing the first and second digital mathematical representations for enriching the taxonomy, by associating keywords of the text documents with the first digital mathematical representation; generating a third digital mathematical representation of the contents; and processing the first digital enriched mathematical representation and third mathematical representation for classifying the contents in the enriched taxonomy.