# File lib/org-ruby/output_buffer.rb, line 151
    def load_custom_markup
      require 'yaml'
      self.class.to_s == 'Orgmode::MarkdownOutputBuffer' ? filter = '^MarkdownMap$' : filter = '^HtmlBlockTag$|^Tags$'
      @custom_blocktags = YAML.load_file(@options[:markup_file]).select {|k| k.to_s.match(filter) }
    end