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The acronym PSVI isn't expanded anywhere in the Structures spec. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002JanMar/0030.html
Proposed text http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/0313.html discussed and approved at Nov. 1 telecon. Erratum E1-32 added