IPTC NewsCodes Controlled Vocabularies
Controlled vocabularies for news industry. 1,100+ media topic concepts for categorizing news.
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Where this one tends to earn its keep.
Automated news article classification
Media monitoring and analysis
News recommendation systems
Editorial content management
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Media & Culture.