Should I use publishDate or datePublished for schema.org Review markup?

I'm using schema.org’s Review and I would like to know if I should use publishDate or datePublished properties.

According to the doc (http://schema.org/Review), it seems to开发者_C百科 be datePublished but in the example they use publishDate.

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I would lean towards 'datePublished', as I can't find 'publishDate' in their full documentation.