diff --git a/.gitignore b/.gitignore
index adcda08..a985dbd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
-*.gemspec
-*.gem
+t*.gem
 *.rbc
 .bundle
 .config
diff --git a/README.md b/README.md
index 765a3c5..2ac383d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-Slogger
+Semlogger
 =======
 
-(Semi-)Structured Logger for Ruby (and Rails)
\ No newline at end of file
+(Semi-)Structured Logger for Ruby (and Rails)
diff --git a/Rakefile b/Rakefile
index e5fad5a..e43cfd8 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,11 +4,11 @@ require 'rake'
 begin
   require 'jeweler'
   Jeweler::Tasks.new do |gem|
-    gem.name = "slogger"
+    gem.name = "semlogger"
     gem.summary = %Q{(Semi-)Structured Logger}
     gem.description = %Q{(Semi-)Structured Logger for Ruby (and Rails)}
     gem.email = %w[Denis.Knauf@gmail.com]
-    gem.homepage = "http://github.com/DenisKnauf/Slogger"
+    gem.homepage = "http://github.com/DenisKnauf/semlogger"
     gem.authors = ["Denis Knauf"]
     gem.files = %w[AUTHORS README.md VERSION LICENSE lib/**/*.rb]
     gem.require_paths = %w[lib]
@@ -43,7 +43,7 @@ end
 
 #task :default => :test
 
-require 'rake/rdoctask'
+require 'rdoc/task'
 Rake::RDocTask.new do |rdoc|
   if File.exist? 'VERSION'
     version = File.read 'VERSION'
@@ -52,7 +52,7 @@ Rake::RDocTask.new do |rdoc|
   end
 
   rdoc.rdoc_dir = 'rdoc'
-  rdoc.title = "Slogger #{version}"
+  rdoc.title = "semlogger #{version}"
   rdoc.rdoc_files.include 'README.md'
   rdoc.rdoc_files.include 'AUTHORS'
   rdoc.rdoc_files.include 'LICENSE'
diff --git a/VERSION b/VERSION
index 8acdd82..7c1886b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.0.1
+0.0.10
diff --git a/lib/semlogger.rb b/lib/semlogger.rb
new file mode 100644
index 0000000..2004a68
--- /dev/null
+++ b/lib/semlogger.rb
@@ -0,0 +1,185 @@
+require 'json'
+
+class Object
+	def to_semlogger
+		[
+			self.class.name.to_sym,
+			self.respond_to?( :serializable_hash) ? self.serializable_hash : self
+		]
+	end
+end
+
+class Exception
+	def to_semlogger
+		[:exception] + super
+	end
+end
+
+class String
+	def to_semlogger
+		[:String, self]
+	end
+end
+
+%w[Numeric FalseClass TrueClass NilClass].each do |cl|
+	Object.const_get( cl).class_eval do
+		def to_semlogger
+			[:const, self]
+		end
+	end
+end
+
+class Semlogger < ::Logger
+	class Base
+		class <<self
+			attr_accessor :logger
+		end
+		attr_accessor :logger
+
+		def initialize
+			@logger = self.class.logger
+		end
+
+		def add severity, logger = nil, &block
+			(logger || @logger).add severity, self, &block
+		end
+
+		::Semlogger::Severity.constants.each do |severity|
+			module_eval <<-EOC, __FILE__, __LINE__+1
+				def #{severity.downcase} *a, &e
+					add #{::Semlogger::Severity.const_get severity}, *a, &e
+				end
+			EOC
+		end
+	end
+
+	class CustomType < Base
+		def initialize name, *obj
+			@name, @obj = name.to_s.to_sym, obj
+		end
+
+		def to_semlogger
+			[@name] + @obj
+		end
+	end
+
+	attr_accessor :logdev, :level, :progname
+
+	# some libs use #log_level
+	def log_level=( level)  @level = level  end
+	def log_level()  @level  end
+
+	class <<self
+		attr_accessor :progname, :logger
+
+		def new_rails_logger config, logdev = nil
+			require 'semlogger/rack'
+			logdev ||= ::Rails.root.join 'log', "#{::Rails.env.to_s.gsub('%', '%%')}.%Y-%m-%d.%$.log"
+			logdev = logdev.to_s
+			logger = nil
+			if Rails.env.production?
+				logger = new logdev
+				logger.level = Semlogger::INFO
+			elsif Rails.env.development?
+				logger = new Semlogger::Multiplex.new( Semlogger::FInfo.new( Semlogger::Printer.new), Semlogger::Writer.new( logdev))
+				logger.level = Semlogger::DEBUG
+			else
+				logger = new logdev
+				logger.level = Semlogger::DEBUG
+			end
+			config.middleware.swap Rails::Rack::Logger, Semlogger::Rack, [], {reqid: :uuid}
+			config.logger = logger
+		end
+
+		def custom( *a)  CustomType.new( *a).tap {|t| t.logger = self.logger }  end
+	end
+	def custom( *a)  CustomType.new( *a).tap {|t| t.logger = self }  end
+
+	@@progname = nil
+
+	def initialize logdev = nil, *a, &e
+		case logdev
+		when String, nil then logdev = ::Semlogger::Writer.new logdev
+		end
+		@progname = a[0] || @@progname
+		@level, @data, @tags, @logdev = DEBUG, {}, [], logdev
+		self.class.logger = self  if !self.class.logger && self.class.logger.is_a?( Semlogger::Default)
+	end
+
+	def tagged *tags, &e
+		@tags += tags.flatten.compact
+		tags = tags.size
+		yield
+	ensure
+		#tags.times { @tags.pop }
+		@tags.slice! -tags .. -1
+	end
+
+	def add severity, message = nil, progname = nil, &block
+		severity ||= UNKNOWN
+		return true  if @logdev.nil? or severity < @level
+		progname ||= @progname
+		if message.nil?
+			if block_given?
+				message = yield
+			else
+				message = progname
+				progname = @progname
+			end
+		end
+		@logdev.add severity, Time.new, progname, format_data( @data), format_tags( @tags), format_msg( message)
+	end
+
+	def format_msg msg
+		msg = msg.to_semlogger
+		case msg
+		when Array then msg
+		else [msg.class.name.to_sym, msg.inspect]
+		end
+	end
+
+	def format_obj obj
+		case obj
+		when Proc then obj.call
+		else obj
+		end
+	end
+
+	def format_tags tags
+		tags = tags ? tags.dup : []
+		tags.map &method( :format_obj)
+	end
+
+	def format_data data
+		data = data ? data.dup : {}
+		data.each {|k,v| data[k] = format_obj v }
+	end
+
+	def data data, &e
+		return @data  unless e
+		@data.update data
+		keys = data.keys
+		yield
+	ensure
+		keys.each &data.method( :delete)
+	end
+
+	def caller &e
+		data caller: Kernel.method(:caller), &e
+	end
+
+	def thread &e
+		data thread: Proc.new { Thread.current.object_id }, &e
+	end
+end
+
+require 'semlogger/rotate'
+require 'semlogger/multiplex'
+require 'semlogger/filter'
+require 'semlogger/writer'
+
+class Semlogger
+	class Default < Semlogger
+	end
+	self.logger ||= Default.new
+end
diff --git a/lib/slogger/filter.rb b/lib/semlogger/filter.rb
similarity index 71%
rename from lib/slogger/filter.rb
rename to lib/semlogger/filter.rb
index 8e68265..cf3dde8 100644
--- a/lib/slogger/filter.rb
+++ b/lib/semlogger/filter.rb
@@ -1,4 +1,4 @@
-class Slogger::Filter
+class Semlogger::Filter
 	attr_accessor :level, :logdev
 
 	def initialize level, logdev
@@ -15,9 +15,9 @@ end
 
 %w[debug info warn error fatal].each do |level|
 	eval <<-EOC
-		class ::Slogger::F#{level.camelcase} < Slogger::Filter
+		class ::Semlogger::F#{level.camelcase} < Semlogger::Filter
 			def initialize *a
-				super Slogger::#{level.upcase}, *a
+				super Semlogger::#{level.upcase}, *a
 			end
 		end
 	EOC
diff --git a/lib/slogger/formatter.rb b/lib/semlogger/formatter.rb
similarity index 93%
rename from lib/slogger/formatter.rb
rename to lib/semlogger/formatter.rb
index 5acfaf1..d0379dc 100644
--- a/lib/slogger/formatter.rb
+++ b/lib/semlogger/formatter.rb
@@ -1,4 +1,4 @@
-class Slogger::Formatter < ::Logger::Formatter
+class Semlogger::Formatter < ::Logger::Formatter
 	def initialize tags, data
 		@tags, @data = tags, data
 	end
diff --git a/lib/slogger/multiplex.rb b/lib/semlogger/multiplex.rb
similarity index 95%
rename from lib/slogger/multiplex.rb
rename to lib/semlogger/multiplex.rb
index e10bb84..4c8430a 100644
--- a/lib/slogger/multiplex.rb
+++ b/lib/semlogger/multiplex.rb
@@ -1,4 +1,4 @@
-class Slogger::Multiplex
+class Semlogger::Multiplex
 	def initialize( *dests)  @__dests__ = dests  end
 
 	def write( *a, &e)  @__dests__.each {|d| d.write *a, &e }  end
diff --git a/lib/semlogger/rack.rb b/lib/semlogger/rack.rb
new file mode 100644
index 0000000..57d3298
--- /dev/null
+++ b/lib/semlogger/rack.rb
@@ -0,0 +1,51 @@
+class Semlogger::Rack < Rails::Rack::Logger
+	def initialize app, tags = nil, data = nil
+		super app, tags
+		@data = data || {}
+	end
+
+	def call_app request, env
+		path = request.filtered_path
+		Rails.logger.custom( :connection, request.ip, Thread.current.object_id, request.request_method, path).info
+		@app.call env
+	ensure
+		ActiveSupport::LogSubscriber.flush_all!
+	end
+
+	def call env
+		request = ActionDispatch::Request.new env
+		compute_tagged_ request do
+			compute_data_ request do
+				call_app request, env
+			end
+		end
+	end
+
+	def compute_tagged_ request
+		if Rails.logger.respond_to? :tagged
+			Rails.logger.tagged( compute_tags( request)) { yield }
+		else
+			yield
+		end
+	end
+
+	def compute_data_ request
+		if Rails.logger.respond_to? :data
+			Rails.logger.data( compute_data( request)) { yield }
+		else
+			yield
+		end
+	end
+
+	def compute_data request
+		data = @data.dup
+		data.each do |k, v|
+			case v
+			when Proc
+				data[k] = v.call request
+			when Symbol
+				data[k] = request.send v
+			end
+		end
+	end
+end
diff --git a/lib/slogger/rotate.rb b/lib/semlogger/rotate.rb
similarity index 62%
rename from lib/slogger/rotate.rb
rename to lib/semlogger/rotate.rb
index 35142e0..9656bcb 100644
--- a/lib/slogger/rotate.rb
+++ b/lib/semlogger/rotate.rb
@@ -1,4 +1,4 @@
-class Slogger::Rotate
+class Semlogger::Rotate
 	attr_reader :file
 
 	def filename()  @filename.dup  end
@@ -9,11 +9,7 @@ class Slogger::Rotate
 
 	def open_if
 		name = Time.now.strftime( @filename).gsub /%\$/, $$.to_s
-		#p at: Time.now, open_if: name, cur: @file ? @file.path : nil, e: @file ? name == @file.path : nil
-		if @file and name == @file.path
-			@file.close
-			@file = nil
-		end
+		close  if @file and name != @file.path
 		@file = File.open name, 'a'  unless @file
 		@file
 	end
@@ -24,5 +20,6 @@ class Slogger::Rotate
 
 	def close
 		@file.close
+		@file = nil
 	end
 end
diff --git a/lib/slogger/tailer.rb b/lib/semlogger/tailer.rb
similarity index 95%
rename from lib/slogger/tailer.rb
rename to lib/semlogger/tailer.rb
index 2afbc24..bf823ef 100644
--- a/lib/slogger/tailer.rb
+++ b/lib/semlogger/tailer.rb
@@ -1,4 +1,4 @@
-class Slogger::Tailer < Rails::Rack::LogTailer
+class Semlogger::Tailer < Rails::Rack::LogTailer
 	def initialize app, log = nil
 		@app = app
 		log ||= Rails.root.join( 'log', Rails.env).to_s.gsub('%', '%%') + '.%Y-%m-%d.%$.log'
diff --git a/lib/slogger/writer.rb b/lib/semlogger/writer.rb
similarity index 57%
rename from lib/slogger/writer.rb
rename to lib/semlogger/writer.rb
index a41a9af..0bda060 100644
--- a/lib/slogger/writer.rb
+++ b/lib/semlogger/writer.rb
@@ -1,17 +1,21 @@
-class Slogger::Output
+class Semlogger::Output
 end
 
-class Slogger::Writer < Slogger::Output
+class Semlogger::Writer < Semlogger::Output
 	def initialize logdev = nil
-		@logdev = logdev || ::Slogger::Rotate.new( ::Rails.root.join( 'log', ::Rails.env).to_s.gsub('%', '%%') + '.%Y-%m-%d.%$.log')
+		@logdev = case logdev
+			when String then ::Semlogger::Rotate.new logdev
+			when nil then ::Semlogger::Rotate.new "log/#{File.basename $0}.%Y-%m-%d.%$.log"
+			else logdev
+			end
 	end
 
 	def add severity, time, progname, data, tags, message
-		@logdev.write [severity, time, progname, data, tags, message].to_json
+		@logdev.write [severity, time.xmlschema(9), progname, data, tags, message].to_json+"\n"
 	end
 end
 
-class Slogger::Printer < Slogger::Output
+class Semlogger::Printer < Semlogger::Output
 	def initialize logdev = nil
 		@logdev = logdev || $stdout
 		@last_reqid = nil
@@ -24,8 +28,7 @@ class Slogger::Printer < Slogger::Output
 				r = "Exception: #{message[2]} (#{message[1]}"
 				r << "\n\t" << message[3].join( "\n\t")  if message[3]
 				r
-			when String, Numeric, true, false, nil then message[0]
-			when :obj then message[1].inspect
+			when :String, :const then message[1]
 			else message.inspect
 			end
 		reqid = data[:reqid]
diff --git a/lib/slogger.rb b/lib/slogger.rb
deleted file mode 100644
index a3dc744..0000000
--- a/lib/slogger.rb
+++ /dev/null
@@ -1,82 +0,0 @@
-require 'json'
-
-class Slogger < ::Logger
-	def initialize logdev = nil, *a, &e
-		case logdev
-		when String, nil then logdev = ::Slogger::Writer.new logdev
-		end
-		@level, @data, @tags, @logdev = DEBUG, {}, [], logdev
-	end
-
-	def tagged tags, &e
-		@tags += tags
-		tags = tags.size
-		yield
-	ensure
-		tags.times { @tags.pop }
-	end
-
-	def add severity, message = nil, progname = nil, &block
-		severity ||= UNKNOWN
-		if @logdev.nil? or severity < @level
-			return true
-		end
-		progname ||= @progname
-		if message.nil?
-			if block_given?
-				message = yield
-			else
-				message = progname
-				progname = @progname
-			end
-		end
-		@logdev.add severity, Time.new, progname, format_data( @data), format_tags( @tags), format_msg( message)
-	end
-
-	def format_msg msg
-		case msg
-		when String, Numeric, true, false, nil then [msg]
-		when Exception then [:exception, msg.class.name, msg.message.to_s, msg.backtrace]
-		else [:obj, msg]
-		end
-	end
-
-	def format_obj obj
-		case obj
-		when Proc then obj.call
-		else obj
-		end
-	end
-
-	def format_tags tags
-		tags = tags ? tags.dup : []
-		tags.map &method( :format_obj)
-	end
-
-	def format_data data
-		data = data ? data.dup : {}
-		data.each {|k,v| data[k] = format_obj v }
-	end
-
-	def data data, &e
-		@data.update data
-		keys = data.keys
-		yield
-	ensure
-		keys.each &data.method( :delete)
-	end
-
-	def caller &e
-		data caller: Kernel.method(:caller), &e
-	end
-
-	def thread &e
-		data thread: Proc.new { Thread.current.object_id }, &e
-	end
-end
-
-require 'slogger/rotate'
-require 'slogger/multiplex'
-require 'slogger/rack'
-require 'slogger/filter'
-require 'slogger/writer'
diff --git a/lib/slogger/rack.rb b/lib/slogger/rack.rb
deleted file mode 100644
index f0cf227..0000000
--- a/lib/slogger/rack.rb
+++ /dev/null
@@ -1,37 +0,0 @@
-class Slogger::Rack < Rails::Rack::Logger
-	def initialize app, tags = nil, data = nil
-		super app, tags
-		@data = data
-	end
-
-	def call_app env
-		request = ActionDispatch::Request.new env
-		path = request.filtered_path
-		Rails.logger.info [:connection, request.ip, Thread.current.object_id, request.request_method, path]
-		@app.call env
-	ensure
-		ActiveSupport::LogSubscriber.flush_all!
-	end
-
-	def call env
-		if @data
-			Rails.logger.data( compute_data( env)) { super env }
-		else
-			super env
-		end
-	end
-
-	def compute_data env
-		request = ActionDispatch::Request.new env
-
-		data = @data.dup
-		data.each do |k, v|
-			case v
-			when Proc
-				data[k] = v.call request
-			when Symbol
-				data[k] = request.send v
-			end
-		end
-	end
-end
diff --git a/lib/slogger/transaction.rb b/lib/slogger/transaction.rb
deleted file mode 100644
index 5ea8676..0000000
--- a/lib/slogger/transaction.rb
+++ /dev/null
@@ -1,28 +0,0 @@
-class Slogger::Transaction
-	include UUIDTools
-	attr_reader :app, :id, :default_id
-
-	class <<self
-		attr_accessor :transaction
-		def to_s()  transaction.to_s  end
-		def id()  transaction.id  end
-	end
-
-	def new_id
-		UUID.random_create
-	end
-
-	def initialize app, logger = nil, default_id = nil
-		@app, @default_id = app, default_id || new_id
-		(logger||self.class).transaction = self
-	end
-
-	def call *paras
-		@id = new_id
-		@app.call *paras
-	ensure
-		@id = @default_id
-	end
-
-	def to_s()  @id.to_s  end
-end
diff --git a/semlogger.gemspec b/semlogger.gemspec
new file mode 100644
index 0000000..da01a17
--- /dev/null
+++ b/semlogger.gemspec
@@ -0,0 +1,50 @@
+# Generated by jeweler
+# DO NOT EDIT THIS FILE DIRECTLY
+# Instead, edit Jeweler::Tasks in Rakefile, and run 'rake gemspec'
+# -*- encoding: utf-8 -*-
+
+Gem::Specification.new do |s|
+  s.name = "semlogger"
+  s.version = "0.0.10"
+
+  s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
+  s.authors = ["Denis Knauf"]
+  s.date = "2012-11-21"
+  s.description = "(Semi-)Structured Logger for Ruby (and Rails)"
+  s.email = ["Denis.Knauf@gmail.com"]
+  s.extra_rdoc_files = [
+    "LICENSE",
+    "README.md"
+  ]
+  s.files = [
+    "AUTHORS",
+    "LICENSE",
+    "README.md",
+    "VERSION",
+    "lib/semlogger.rb",
+    "lib/semlogger/filter.rb",
+    "lib/semlogger/formatter.rb",
+    "lib/semlogger/multiplex.rb",
+    "lib/semlogger/rack.rb",
+    "lib/semlogger/rotate.rb",
+    "lib/semlogger/tailer.rb",
+    "lib/semlogger/writer.rb"
+  ]
+  s.homepage = "http://github.com/DenisKnauf/semlogger"
+  s.require_paths = ["lib"]
+  s.rubygems_version = "1.8.23"
+  s.summary = "(Semi-)Structured Logger"
+
+  if s.respond_to? :specification_version then
+    s.specification_version = 3
+
+    if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
+      s.add_runtime_dependency(%q<json>, [">= 0"])
+    else
+      s.add_dependency(%q<json>, [">= 0"])
+    end
+  else
+    s.add_dependency(%q<json>, [">= 0"])
+  end
+end
+