[XXE] docbook v5, firstname, surname, etc

[Chris Chiasson]

Maybe I'm just dumb, but I can't add a firstname or surname element as
the child of an otherwise blank personname element using docbook
version 5 (rng) under XXE. I noticed that the sample.xml file has
these elements and that I can copy and paste the entire personname
element to my article from the sample article.
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