* RFC 1123 での定義

[3] 
>
:"MUST":
This word or the adjective "REQUIRED" means that the item
is an absolute requirement of the specification.

;; [CITE@en[RFC 1123 - Requirements for Internet Hosts - Application and Support]] ([TIME[2010-07-22 04:07:59 +09:00]] 版) <http://tools.ietf.org/html/rfc1123#page-11>

* メモ

[1]
[CITE@en[XML Query (XQuery) Requirements]] ([CODE[2007-03-17 06:39:09 +09:00]] 版) <http://www.w3.org/TR/2007/NOTE-xquery-requirements-20070323/#terminology-must>
([[名無しさん]])


[2]
[CITE@en[XML Query (XQuery) 1.1 Requirements]] ([TIME[2007-03-16 09:42:40 +09:00]] 版) <http://www.w3.org/TR/2007/WD-xquery-11-requirements-20070323/#terminology-must>


[4] [CITE@en[RFC 4835 - Cryptographic Algorithm Implementation Requirements for Encapsulating Security Payload (ESP) and Authentication Header (AH)]]
( ([TIME[2011-02-03 22:05:20 +09:00]] 版))
<http://tools.ietf.org/html/rfc4835#page-4>

[5] [CITE@en[RFC 4305 - Cryptographic Algorithm Implementation Requirements for Encapsulating Security Payload (ESP) and Authentication Header (AH)]]
( ([TIME[2011-01-08 12:17:45 +09:00]] 版))
<http://tools.ietf.org/html/rfc4305#section-2>

[6] [CITE@en-us[Ontology for Media Resources 1.0]]
( ([TIME[2012-02-07 07:39:04 +09:00]] 版))
<http://www.w3.org/TR/2012/REC-mediaont-10-20120209/#conformance>