[1] W3C XML Schema Definition Language (XSD): Component Designators ( 版) <http://www.w3.org/TR/2008/WD-xmlschema-ref-20080910/>
[2] W3C XML Schema Definition Language (XSD): Component Designators ( 版) <http://www.w3.org/TR/2010/CR-xmlschema-ref-20100119/>