There has been a bit of talk about “custom taxonomies” in WordPress, which have been around since version 2.3, and how WordPress 2.8 will integrate them into the interface in some amazing, better-than-sliced-bread way.
Many of the posts out there, unfortunately, never explained in a clear manner what custom taxonomies were. They talked of how amazing the concept was, and things like that, but they didn’t lay out the concept so people could understand the concept.
Justin Tadlock has a comprehensive post, Custom taxonomies in WordPress 2.8, that explains the concept very well, and has pretty much everything you need to know. What’s coming in 2.8, what’s already in WP, code snippets illustrating the use of the Custom Taxonomy API, etc.
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