Who uses SGML?
Securities and Exchange Commission -- corporate information (EDGAR)
Novell, O’Reilly -- software documentation (DocBook)
Society of Automotive Engineers -- auto documentation (J-2008)
Department of Defense -- documentation and standards (CALS)
Boeing -- technical documentation (ATA-2100)
Elsevier, McGraw-Hill, Routledge -- journals and reference works (ISO 12083, TEI)
University of Michigan -- finding aids, electronic texts, theses and dissertations (EAD, TEI, ETD)