Seeking guidance on use of X<...> in pods

[email protected] (karl williamson)
Newsgroups perl.pod-people
Message-ID <[email protected]>
I couldn't find any documentation on when to use X<...>.  I would have 
thought it would be reserved for the single (or few) main defining text 
that applies to the indexed term, but it appears that existing practice 
uses it for minor mentions of the term.
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