instruct! (Builder::XmlMarkup)

         # File lib/builder/xmlmarkup.rb, line 238
    238:     def instruct!(directive_tag=:xml, attrs={})
    239:       _ensure_no_block block_given?
    240:       if directive_tag == :xml
    241:         a = { :version=>"1.0", :encoding=>"UTF-8" }
    242:         attrs = a.merge attrs
    243:       end
    244:       _special(
    245:       "<?#{directive_tag}",
    246:       "?>",
    247:       nil,
    248:       attrs,
    249:       [:version, :encoding, :standalone])
    250:     end