diff --git a/lib/knot/interface.rb b/lib/knot/interface.rb
index 221af51..2825e97 100644
--- a/lib/knot/interface.rb
+++ b/lib/knot/interface.rb
@@ -127,37 +127,39 @@ class Knot::Conf
 		self.commit
 	end
 
-	def parse_item k
-		case k
+	def parse_item kv
+		case kv
 		when Hash
-			case k.keys.sort
-			when %w[section], %w[id section], %w[item section], %w[id item section]
-				k
+			r = {}
+			kv.each {|k,v| r[k.to_s.to_sym] = v }
+			case r.keys.sort
+			when %i[section], %i[id section], %i[item section], %i[id item section]
+				r
 			else
-				raise ArgumentError, "Invalid Item-format"
+				raise ArgumentError, "Invalid Item-format: #{k}"
 			end
 
 		when Array
-			case k.length
-			when 1 then {section: k[0]}
-			when 2 then {section: k[0], item: k[1]}
-			when 3 then {section: k[0], id: k[1], item: k[2]}
-			else raise ArgumentError, "Invalid Item-format"
+			case kv.length
+			when 1 then {section: kv[0]}
+			when 2 then {section: kv[0],            item: kv[1]}
+			when 3 then {section: kv[0], id: kv[1], item: kv[2]}
+			else raise ArgumentError, "Invalid Item-format: #{kv}"
 			end
 
 		when /\A
-					(?<section> [a-z0-9_-]+ )
-					(?: \[ (?<id> [a-z0-9_.-]+) \] )?
-					(?: \. (?<item>[a-z0-9_-]+) )?
+			(?<section> [a-z0-9_-]+ )
+			(?: \[ (?<id> [a-z0-9_.-]+) \] )?
+				(?: \. (?<item>[a-z0-9_-]+) )?
 				\z/xi
 
-			$~.named_captures.delete_if {|_,v| v.nil? }
+				$~.named_captures.delete_if {|_,v| v.nil? }
 
 		when nil
 			{}
 
 		else
-			raise ArgumentError, "Invalid Item-format"
+			raise ArgumentError, "Invalid Item-format: #{kv}"
 		end
 	end
 
diff --git a/lib/knot/protocol.rb b/lib/knot/protocol.rb
index 247e7d8..21c8463 100644
--- a/lib/knot/protocol.rb
+++ b/lib/knot/protocol.rb
@@ -73,34 +73,69 @@ end
 #end
 
 module Knot::Protocol::Idx
+	class Id
+		include Comparable
+		attr_reader :name, :code, :cname, :description
+
+		def initialize name, code, cname, description
+			raise ArgumentError, "Expecting Symbol for Idx::Id instead of: #{name.inspect}"  if Symbol === name
+			raise ArgumentError, "Expecting Integer for Idx::Id instead of: #{code.inspect}"  if Integer === code
+			@name, @code, @cname, @description = name, code, cname, description
+			freeze
+		end
+
+		def === x
+			case x
+			when self.class then self == x
+			when Symbol then @name == x
+			when String then @name == x.to_sym
+			when Integer then @code == x
+			else nil
+			end
+		end
+
+		def <=>( x)  @id <=> x.id  end
+		def to_s()  @name.to_s  end
+		def to_sym()  @name  end
+		def to_i()  @code  end
+	end
+
 	Idx = [
-		:command, # 10, :CMD,     # Control command name.
-		:flags,   # 11, :FLAGS,   # Control command flags.
-		:error,   # 12, :ERROR,   # Error message.
-		:section, # 13, :SECTION, # Configuration section name.
-		:item,    # 14, :ITEM,    # Configuration item name.
-		:id,      # 15, :ID,      # Congiguration item identifier.
-		:zone,    # 16, :ZONE,    # Zone name.
-		:owner,   # 17, :OWNER,   # Zone record owner
-		:ttl,     # 18, :TTL,     # Zone record TTL.
-		:type,    # 19, :TYPE,    # Zone record type name.
-		:data,    # 1a, :DATA,    # Configuration item/zone record data.
-		:filter,  # 1b, :FILTER,  # An option or a filter for output data processing.
+		Id.new( :command, 0x10, :CMD,     'Control command name.'),
+		Id.new( :flags,   0x11, :FLAGS,   'Control command flags.'),
+		Id.new( :error,   0x12, :ERROR,   'Error message.'),
+		Id.new( :section, 0x13, :SECTION, 'Configuration section name.'),
+		Id.new( :item,    0x14, :ITEM,    'Configuration item name.'),
+		Id.new( :id,      0x15, :ID,      'Congiguration item identifier.'),
+		Id.new( :zone,    0x16, :ZONE,    'Zone name.'),
+		Id.new( :owner,   0x17, :OWNER,   'Zone record owner'),
+		Id.new( :ttl,     0x18, :TTL,     'Zone record TTL.'),
+		Id.new( :type,    0x19, :TYPE,    'Zone record type name.'),
+		Id.new( :data,    0x1a, :DATA,    'Configuration item/zone record data.'),
+		Id.new( :filter,  0x1b, :FILTER,  'An option or a filter for output data processing.'),
 	]
 	Name = {}
 	Code = {}
-	Idx.each_with_index do |v, i|
-		Code[0x10+i] = v
-		Name[v] = i
+
+	Idx.each do |id|
+		Code[id.to_i] = id
+		Name[id.to_sym] = id
 	end
-	def self.[] k
-		case k
-		when Symbol
-			Name[k] or raise Knot::Errors::EINVAL, "Unknown Idx: #{k}"
-		when Integer
-			Idx[k] or raise Knot::Errors::EINVAL, "Unknown Idx: #{k}"
-		else
-			raise ArgumentError, "Unknown Idx-Type: #{k}"
+
+	class <<self
+		def [] k
+			case k
+			when Symbol
+				Name[k] or raise Knot::Errors::EINVAL, "Unknown Idx: #{k}"
+			when Integer
+				Code[k] or raise Knot::Errors::EINVAL, "Unknown Idx: #{k}"
+			else
+				raise ArgumentError, "Unknown Idx-Type: #{k}"
+			end
+		end
+
+		def each &exe
+			block_given? ? Idx.each( &exe) : Idx.to_enum( :each)
 		end
 	end
 end
@@ -125,7 +160,7 @@ class Knot::Protocol
 
 	def snd sock: nil, **data
 		rsock = sock || @sock
-		s = ''
+		s = ''.b
 		sock = StringIO.new s
 		sock.write [1].pack( 'c')
 		data[:flags] ||= ''
@@ -135,7 +170,7 @@ class Knot::Protocol
 		end
 		sock.write [3].pack( 'c')
 		sock.flush
-		STDERR.puts( {data: data, _: s}.inspect)  if @debug
+		STDERR.puts( {send: data, _: s}.inspect)  if @debug
 		rsock.write s
 		rsock.flush
 	end
@@ -144,15 +179,15 @@ class Knot::Protocol
 		attr_reader :str
 
 		def initialize sock, str = nil
-			@str, @sock = str || '', sock
+			@str, @sock = str || ''.b, sock
 		end
 
 		def unpack pattern
-			IOUnpack.new(pattern).unpack self
+			IOUnpack.new( pattern).unpack self
 		end
 
 		def unpack1 pattern
-			IOUnpack.new(pattern).unpack1 self
+			IOUnpack.new( pattern).unpack1 self
 		end
 
 		def read n
@@ -182,7 +217,7 @@ class Knot::Protocol
 			end
 		end
 	ensure
-		STDERR.puts( {rcvd: ret, read: sock.str}.inspect)  if @debug
+		STDERR.puts( {rcvd: ret, _: sock.str}.inspect)  if @debug
 		ret
 	end