Extension functions or system properties

Henry used p:psvi-available() in his recent example. That got me
thinking. We have a mixture of system properties and extension
functions and I don't think we've made any sort of consistent choice
about which is which.

Looking at our list of system properties, I wonder if we should promote
p:episode, p:language, p:xpath-version and p:psvi-supported (as well,
perhaps, as p:psvi-available) to extension functions.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | It is not failure of others to
http://nwalsh.com/            | appreciate your abilities that should
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                              | appreciate theirs.-- Confucius