http://rdfs.org/sioc/ns#topic
used by 15:
- artenuevosmedios-gnoss
- didactalia
- gnoss
- gnoss-com-a-social-and-semantic-platform
- green-competitiveness-gnoss
- ineverycrea
- ineverycrea-argentina
- miguiadeviajes-gnoss
- nextweb-gnoss
- open-data-risp
- portal-turismo-de-la-rioja
- prospects-and-trends-gnoss
- proyectoapadrina
- red-uno-internacional-santillana
- rkb-explorer-webconf
