--- URI::Generic#merge(rel)
--- URI::Generic#+(rel)

    rel Ϣ뤹롣
    rel ʸξ URI::parse(rel) ˤäơ
    URI ѴƤϢ뤹롣

        require 'uri'
        p URI.parse('http://www.ruby-lang.org/') + '/en/raa.html'
        => #<URI::HTTP:0x201001c0 URL:http://www.ruby-lang.org/en/raa.html>

