[1] [CITE@EN[XForms 1.1]]
([TIME[2009-10-20 22:51:54 +09:00]] 版)
<http://www.w3.org/TR/2009/REC-xforms-20091020/#fn-if>

[2] [CITE@en[draft-ietf-core-link-format-14 - CoRE Link Format]]
( ([TIME[2012-06-05 06:03:10 +09:00]] 版))
<http://tools.ietf.org/html/draft-ietf-core-link-format-14#section-3.2>