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Specification: https://html.spec.whatwg.org/multipage/microdata.html Multipage: https://html.spec.whatwg.org/multipage/#examples-4 Complete: https://html.spec.whatwg.org/#examples-4 Referrer: Comment: http://n.whatwg.org/work is not a known valid target type for the copyrightHolder property. Posted from: 114.79.36.129 User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36
It's a value defined by HTML. It's not clear what you consider to be wrong here.