[DOCS] no more SGML empty tags

In XML, empty tags such as </> are no longer allowed.  In preparation
for converting the documentation to DocBook XML, I have committed a
patch that expands all such empty tags.  There is also now a warning
from onsgmls when empty tags are used.  (There is no -werror option,
unfortunately.)

(I have found that in a fully tagged SGML source file, an editor's XML
tab completion works much better, so maybe try that if you want to avoid
additional typing.)

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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