Taxonomies continue to be a very popular topic. See our Taxonomies page here on this site.
Raritan Technologies in New Jersey includes a number of products and services to taxonomy-enable your site. From their site:
Pre-built taxonomies allow an organization to get started quickly with a taxonomy search/navigation project. There's no need to start from scratch, use taxonomies built by classification experts. If an organization has browse capabilities or hierarchical structures, they can often be used to seed a taxonomy.
See their taxonomy page at:
http://www.raritantechnologies.com/Taxonomies.shtml
Comments