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The issues that come here are how to specify the relationships between authors of the same entity, such as a post, or how do you specify multiple authors on a site and identify them.
So, how, in a page with multiple authors, do you specify where their definitive information lays, as opposed to the version they want for that particular location.
For example, if Alice is publishing a site with Bob and Jim, she may wish to craft information on that site specifically geared toward that audience...for example, an email address specifically for that site. But she may wish to link to an expanded version elsewhere on her own site.