ruby on rails - Builder GEM XML formatting -


i'm using ruby gem builder, , need output.. 

<?xml version="1.0" encoding="utf-8"?> <fileattachment> "name of file here.xls"   <data>zip</data>   <size>7434</size> </fileattachment>

my code below, file name next "fileattachment" isn't working.. simple i'm not seeing it?? error says can't mix text block.. makes sense don't know correct syntax.

 xml = builder::xmlmarkup.new(:indent => 2 )  xml.instruct! :xml,:version=>"1.0", :encoding => "utf-8"    xml.fileattachment("name of file here.xls")      xml.data "zip"      xml.size "7434"    end

i think want use text! method:

xml.fileattachment   xml.text! "name of file here.xls"   xml.data "zip"   xml.size "7434" end

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