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This adds the ability to pretty-print XML documents ... according to libxml's somewhat idiosyncratic notions of what's pretty, anyway. One notable divergence from a strict reading of the spec is that libxml is willing to collapse empty nodes "<node></node>" to just "<node/>", whereas SQL and the underlying XML spec say that this option should only result in whitespace tweaks. Nonetheless, it seems close enough to justify using the SQL-standard syntax. Jim Jones, reviewed by Peter Smith and myself Discussion: https://postgr.es/m/2f5df461-dad8-6d7d-4568-08e10608a69b@uni-muenster.de