Referring strings
The <rs> (referring string)
element is used for any kind of
name or reference
   <q>My dear <rs type=“person”
key=“BENM1”>Mr. Bennet</rs>,</q>
said <rs type=“person” key=“BENM2”>
his lady</rs> to him one day,<q>have
you heard that <rs type=“place”
key=“NETP1”>Netherfield Park</rs> is
let at last?</q>
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