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-EPUB3] World Wide Web Consortium, "EPUB Publications 3.0.1", Recommended Specification 26 June 2014, http://www.idpf.org/epub/301/spec/epub-publications-20140626.html