Custom Taxonomies In WordPress
They are two different “taxonomies,” that is, ways to classify a post. It is a some what of an advanced technique, but WordPress allows you to create additional taxonomies for classification purposes.
A perfect example is a site that was built to review movies. Movie reviews are classifiable in so many ways: by Date, Actors, Genre, Director, Producer, and the list could go on and on. Categories and Tags alone are insufficient to create the ideal navigational structure for this site. What we could do is create new taxonomies for all these different classifications. Behaviorally, and interface-wise, they behave just like tags.
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