Which of the following are correct XML Namespace declarations?( )
body xmlns:hns="http://www.w3.org/TR/html4/"
html xmlns='http://www.w3.org/1999/xhtml'
hns:body hns="http://www.w3.org/TR/html4/"
lt;hns:body xmlns:hns="http://www.w3.org/TR/html4/"
青云测评
