[1] [CITE[RDFa 1.1 Primer]]
( ([TIME[2012-05-31 23:39:22 +09:00]] 版))
<http://www.w3.org/TR/2012/NOTE-rdfa-primer-20120607/#default_prefixes>

[2] [CITE[RDFa 1.1 Primer]]
( ([TIME[2012-05-31 23:39:22 +09:00]] 版))
<http://www.w3.org/TR/2012/NOTE-rdfa-primer-20120607/#using-the-content-attribute>

[3] [CITE[RDFa Core Initial Context]]
( ([TIME[2013-03-29 19:51:55 +09:00]] 版))
<http://www.w3.org/2011/rdfa-context/rdfa-1.1>