diff --git a/.gitignore b/.gitignore
index a985dbd..adcda08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
-t*.gem
+*.gemspec
+*.gem
 *.rbc
 .bundle
 .config
diff --git a/README.md b/README.md
index 2ac383d..765a3c5 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-Semlogger
+Slogger
 =======
 
-(Semi-)Structured Logger for Ruby (and Rails)
+(Semi-)Structured Logger for Ruby (and Rails)
\ No newline at end of file
diff --git a/Rakefile b/Rakefile
index e43cfd8..e5fad5a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,11 +4,11 @@ require 'rake'
 begin
   require 'jeweler'
   Jeweler::Tasks.new do |gem|
-    gem.name = "semlogger"
+    gem.name = "slogger"
     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/semlogger"
+    gem.homepage = "http://github.com/DenisKnauf/Slogger"
     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 'rdoc/task'
+require 'rake/rdoctask'
 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 = "semlogger #{version}"
+  rdoc.title = "Slogger #{version}"
   rdoc.rdoc_files.include 'README.md'
   rdoc.rdoc_files.include 'AUTHORS'
   rdoc.rdoc_files.include 'LICENSE'
diff --git a/VERSION b/VERSION
index 7c1886b..8acdd82 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.0.10
+0.0.1
diff --git a/lib/semlogger.rb b/lib/semlogger.rb
deleted file mode 100644
index 2004a68..0000000
--- a/lib/semlogger.rb
+++ /dev/null
@@ -1,185 +0,0 @@
-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/semlogger/rack.rb b/lib/semlogger/rack.rb
deleted file mode 100644
index 57d3298..0000000
--- a/lib/semlogger/rack.rb
+++ /dev/null
@@ -1,51 +0,0 @@
-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.rb b/lib/slogger.rb
new file mode 100644
index 0000000..a3dc744
--- /dev/null
+++ b/lib/slogger.rb
@@ -0,0 +1,82 @@
+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/semlogger/filter.rb b/lib/slogger/filter.rb
similarity index 71%
rename from lib/semlogger/filter.rb
rename to lib/slogger/filter.rb
index cf3dde8..8e68265 100644
--- a/lib/semlogger/filter.rb
+++ b/lib/slogger/filter.rb
@@ -1,4 +1,4 @@
-class Semlogger::Filter
+class Slogger::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 ::Semlogger::F#{level.camelcase} < Semlogger::Filter
+		class ::Slogger::F#{level.camelcase} < Slogger::Filter
 			def initialize *a
-				super Semlogger::#{level.upcase}, *a
+				super Slogger::#{level.upcase}, *a
 			end
 		end
 	EOC
diff --git a/lib/semlogger/formatter.rb b/lib/slogger/formatter.rb
similarity index 93%
rename from lib/semlogger/formatter.rb
rename to lib/slogger/formatter.rb
index d0379dc..5acfaf1 100644
--- a/lib/semlogger/formatter.rb
+++ b/lib/slogger/formatter.rb
@@ -1,4 +1,4 @@
-class Semlogger::Formatter < ::Logger::Formatter
+class Slogger::Formatter < ::Logger::Formatter
 	def initialize tags, data
 		@tags, @data = tags, data
 	end
diff --git a/lib/semlogger/multiplex.rb b/lib/slogger/multiplex.rb
similarity index 95%
rename from lib/semlogger/multiplex.rb
rename to lib/slogger/multiplex.rb
index 4c8430a..e10bb84 100644
--- a/lib/semlogger/multiplex.rb
+++ b/lib/slogger/multiplex.rb
@@ -1,4 +1,4 @@
-class Semlogger::Multiplex
+class Slogger::Multiplex
 	def initialize( *dests)  @__dests__ = dests  end
 
 	def write( *a, &e)  @__dests__.each {|d| d.write *a, &e }  end
diff --git a/lib/slogger/rack.rb b/lib/slogger/rack.rb
new file mode 100644
index 0000000..f0cf227
--- /dev/null
+++ b/lib/slogger/rack.rb
@@ -0,0 +1,37 @@
+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/semlogger/rotate.rb b/lib/slogger/rotate.rb
similarity index 62%
rename from lib/semlogger/rotate.rb
rename to lib/slogger/rotate.rb
index 9656bcb..35142e0 100644
--- a/lib/semlogger/rotate.rb
+++ b/lib/slogger/rotate.rb
@@ -1,4 +1,4 @@
-class Semlogger::Rotate
+class Slogger::Rotate
 	attr_reader :file
 
 	def filename()  @filename.dup  end
@@ -9,7 +9,11 @@ class Semlogger::Rotate
 
 	def open_if
 		name = Time.now.strftime( @filename).gsub /%\$/, $$.to_s
-		close  if @file and name != @file.path
+		#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
 		@file = File.open name, 'a'  unless @file
 		@file
 	end
@@ -20,6 +24,5 @@ class Semlogger::Rotate
 
 	def close
 		@file.close
-		@file = nil
 	end
 end
diff --git a/lib/semlogger/tailer.rb b/lib/slogger/tailer.rb
similarity index 95%
rename from lib/semlogger/tailer.rb
rename to lib/slogger/tailer.rb
index bf823ef..2afbc24 100644
--- a/lib/semlogger/tailer.rb
+++ b/lib/slogger/tailer.rb
@@ -1,4 +1,4 @@
-class Semlogger::Tailer < Rails::Rack::LogTailer
+class Slogger::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/transaction.rb b/lib/slogger/transaction.rb
new file mode 100644
index 0000000..5ea8676
--- /dev/null
+++ b/lib/slogger/transaction.rb
@@ -0,0 +1,28 @@
+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/lib/semlogger/writer.rb b/lib/slogger/writer.rb
similarity index 57%
rename from lib/semlogger/writer.rb
rename to lib/slogger/writer.rb
index 0bda060..a41a9af 100644
--- a/lib/semlogger/writer.rb
+++ b/lib/slogger/writer.rb
@@ -1,21 +1,17 @@
-class Semlogger::Output
+class Slogger::Output
 end
 
-class Semlogger::Writer < Semlogger::Output
+class Slogger::Writer < Slogger::Output
 	def initialize logdev = nil
-		@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
+		@logdev = logdev || ::Slogger::Rotate.new( ::Rails.root.join( 'log', ::Rails.env).to_s.gsub('%', '%%') + '.%Y-%m-%d.%$.log')
 	end
 
 	def add severity, time, progname, data, tags, message
-		@logdev.write [severity, time.xmlschema(9), progname, data, tags, message].to_json+"\n"
+		@logdev.write [severity, time, progname, data, tags, message].to_json
 	end
 end
 
-class Semlogger::Printer < Semlogger::Output
+class Slogger::Printer < Slogger::Output
 	def initialize logdev = nil
 		@logdev = logdev || $stdout
 		@last_reqid = nil
@@ -28,7 +24,8 @@ class Semlogger::Printer < Semlogger::Output
 				r = "Exception: #{message[2]} (#{message[1]}"
 				r << "\n\t" << message[3].join( "\n\t")  if message[3]
 				r
-			when :String, :const then message[1]
+			when String, Numeric, true, false, nil then message[0]
+			when :obj then message[1].inspect
 			else message.inspect
 			end
 		reqid = data[:reqid]
diff --git a/semlogger.gemspec b/semlogger.gemspec
deleted file mode 100644
index da01a17..0000000
--- a/semlogger.gemspec
+++ /dev/null
@@ -1,50 +0,0 @@
-# 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
-