[1] XQuery 1.0: An XML Query Language (Second Edition) ( (2011-01-05 01:29:08 +09:00 版)) <http://www.w3.org/TR/2010/REC-xquery-20101214/#dt-in-scope-namespaces>

[2] XML Path Language (XPath) 2.0 (Second Edition) ( (2011-01-05 01:25:51 +09:00 版)) <http://www.w3.org/TR/2010/REC-xpath20-20101214/#dt-in-scope-namespaces>