prefix_of( node, namespace=nil ) private

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# File lib/rexml/light/node.rb, line 184
                        def prefix_of( node, namespace=nil )
                                if not namespace
                                        name = node.name
                                        name =~ NAMESPLIT
                                        $1
                                else
                                        ns = at(3).find { |k,v| v == namespace }
                                        ns ? ns : prefix_of( node.parent, namespace )
                                end
                        end
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