* lib/rss/parser.rb: added class name registry for complex model
elements. (ex. have childlen elements, have some attributes and
a child element and so on.)
* lib/rss/maker/base.rb: added default current_element implementation.
* lib/rss/maker/dublincore.rb: supported multiple DublinCore items.
* lib/rss/maker/image.rb: supproted new DublinCore API.
* lib/rss/trackback.rb (RSS::TrackBackUtils.new_with_value_if_need):
moved to RSS::Utils.
* lib/rss/utils.rb (RSS::Utils.new_with_value_if_need):
moved from RSS::TrackBackUtils.
* lib/rss/maker/image.rb: fixed invalid argument of
add_need_initialize_variable bug.
* lib/rss/maker/trackback.rb: ditto.
* lib/rss/rss.rb (Hash#merge): added for ruby 1.6.
* lib/rss/rss.rb (RSS::BaseModel.date_writer): changed to accept nil
for date value.
* test/test_dublincore.rb: added tests for plural accessor and
multiple DublinCore items.
* test/test_setup_maker_1.0.rb: fixed swapped actual and expected
values.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8252 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
