1.2.1 Normative References

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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

[W3C-PICS-Labels] World Wide Web Consortium, "PICS Label Distribution Label Syntax and Communication Protocols Version 1.1", W3C Recommendation 31-October-96, http://www.w3.org/TR/REC-PICS-labels-961031