… Ambiguity

I remember back when President Bush was in the White House.

...
Bush, George Herbert Walker President of the United States Bush, George W. President of the United States
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You can use this same technique if there are two or more people who are ambiguously referred to, or easily confused in a text. In the example above, we see that "president Bush" could either be George Herbert Walker Bush or George Dubya.

In these cases, we create an alt element, with an xml:id, which points to both personography entries. Whenever we use ref, and point to the xml:id of the alt, we are saying, this is a reference to one of the personography entries listed, but not both.

Contextual Nuances, slide 9 of 11