This wasn't altogether satisfactory because it meant you would be omitting the end-tag, so we actually amended SGML so that you could specify separate delimiters for start-tag close and the end-tag when using NET markup minimization.  With this approach, the NESTC (net-enabling start-tag close) delimiter is "/", and the NET delimiter (used just for the end-tag) is ">".  See

http://www.w3.org/TR/NOTE-sgml-xml-971215

James