How to create an XML document with a namespaced root element with Nokogiri Builder

Question

I\'m implementing an exporter for XML data that requires namespaces. I\'m using Nokogiri\'s XML Builder (version 1.4.0) to do this, however, I can\'t get Nokogiri to create

Answer 1

Three years after Luke's answer, it's gotten yet simpler. You can now use the namespace "before" it's defined. This code:

require 'nokogiri'

NAMESPACES = { 'xmlns:foo' => 'bar', 'xmlns:baz' => 'bat' }

builder = Nokogiri::XML::Builder.new { |xml|
  xml['foo'].RootElement(NAMESPACES) {
    xml['baz'].FirstChild
  }
}

puts builder.to_xml

Outputs this XML: