Ruby on Rails 中 rss feed 的 xml 生成中的命名空间前缀和 cdata 标记

使用 Ruby on Rails 构建网站时，经常需要生成和处理 RSS Feed 的 XML 数据。在生成 XML 的过程中，我们可能会遇到两个常见的问题：命名空间前缀和 CDATA 标记。

ruby
builder = Nokogiri::XML::Builder.new do |xml|
  xml.feed('xmlns:dc' => 'http://purl.org/dc/elements/1.1/') do
    xml.dc:title 'My RSS Feed'
    xml.dc:description 'This is my RSS feed.'
    xml.item do
      xml.dc:title 'Item 1'
      xml.dc:description 'This is item 1.'
    end
    xml.item do
      xml.dc:title 'Item 2'
      xml.dc:description 'This is item 2.'
    end
  end
end
xml = builder.to_xml

ruby
builder = Nokogiri::XML::Builder.new do |xml|
  xml.feed do
    xml.title do
      xml.cdata 'This is a title.'
    end
    xml.description do
      xml.cdata 'This is a description.'
    end
  end
end
xml = builder.to_xml

ruby
builder = Nokogiri::XML::Builder.new do |xml|
  xml.feed('xmlns:dc' => 'http://purl.org/dc/elements/1.1/') do
    xml.title do
      xml.cdata 'This is a title.'
    end
    xml.description do
      xml.cdata 'This is a description.'
    end
  end
end
xml = builder.to_xml