1.2.1 Normative References
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[ISO-32000-1] ISO, "Document management -- Portable document format -- Part 1: PDF 1.7", ISO 32000-1:2800, July 2008, http://www.iso.org/iso/catalogue_detail.htm?csnumber=51502
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt