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diff --git a/lib/sisu/shared_sem.rb b/lib/sisu/shared_sem.rb
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+# encoding: utf-8
+=begin
+
+* Name: SiSU
+
+** Description: documents, structuring, processing, publishing, search
+*** Sematic tags
+
+** Author: Ralph Amissah
+  <ralph@amissah.com>
+  <ralph.amissah@gmail.com>
+
+** Copyright: (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+  2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Ralph Amissah,
+  All Rights Reserved.
+
+** License: GPL 3 or later:
+
+  SiSU, a framework for document structuring, publishing and search
+
+  Copyright (C) Ralph Amissah
+
+  This program is free software: you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or (at your option)
+  any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program. If not, see <http://www.gnu.org/licenses/>.
+
+  If you have Internet connection, the latest version of the GPL should be
+  available at these locations:
+  <http://www.fsf.org/licensing/licenses/gpl.html>
+  <http://www.gnu.org/licenses/gpl.html>
+
+  <http://www.sisudoc.org/sisu/en/manifest/gpl.fsf.html>
+
+** SiSU uses:
+  * Standard SiSU markup syntax,
+  * Standard SiSU meta-markup syntax, and the
+  * Standard SiSU object citation numbering and system
+
+** Hompages:
+  <http://www.jus.uio.no/sisu>
+  <http://www.sisudoc.org>
+
+** Git
+  <http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=summary>
+  <http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=blob;f=lib/sisu/shared_sem.rb;hb=HEAD>
+
+=end
+module SiSU_Sem
+  require_relative 'dp'                                 # dp.rb
+  class Tags
+    def initialize(para,md)
+      @para,@md=para,md
+    end
+    def rgx
+      def exclude
+        /^(?:<:code>|%+ )/
+      end
+      def each_csc
+        /(?:;|(?:[a-z]+(?:[_:.][a-z]+)+|[a-z]*):)\{|\}[:;][a-z]+(?:[_:.][a-z]+)*/m
+      end
+      def each_c
+        /(?:[a-z]+(?:[_:.][a-z]+)+|[a-z]*):\{|\}:[a-z]+(?:[_:.][a-z]+)*/m
+      end
+      def each_sc
+        /(?:[a-z]+(?:[_:.][a-z]+)+|[a-z]*);\{|\};[a-z]+(?:[_:.][a-z]+)*/m
+      end
+      def pair_csc
+        /(([a-z]+(?:[_:.][a-z]+)+|[a-z]+)(?::\{(.+?)\}:\2)|([:;])\{(.+?)\}\4[a-z]+(?:[_:.][a-z]+)*)/m
+      end
+      def pair_c
+        /(([a-z]+(?:[_:.][a-z]+)*)(?::\{(.+?)\}:\2)|:\{(.+?)\}:[a-z]+(?:[_:.][a-z]+)*)/m
+      end
+      def pair_sc
+        /(;\{.+?\};[a-z]+(?:[_:.][a-z]+)*)/m
+      end
+      def whole_csc_ae
+        /(([a-z]+(?:[_.][a-z]+)+|[a-z]*)(?::\[(.+?)\]:\2)|;\{(.+?)\};(?:[a-z]+(?:[_:.][a-z]+)+|[a-z]+)\b)/m
+      end
+      def each_csc_ae
+        /(?:;|(?:[a-z]+(?:[_:.][a-z]+)+)*:|[a-z]*:)\[|\][:;](?:[a-z]+(?:[_:.][a-z]+)+|[a-z]+)/m
+      end
+      self
+    end
+    def print
+      def scan_pair_c
+        if @para =~ rgx.pair_c
+          matched=@para.scan(rgx.pair_c).flatten
+          puts matched[0] unless matched[0].nil?
+        end
+      end
+      def scan_pair_sc
+        matched=@para.scan(rgx.pair_sc).flatten
+        puts matched[0] unless matched[0].nil?
+      end
+      def if_pair_c
+        if @para=~/([a-z](?:[a-z_:.]+?[a-z])?)+(?::\{(.+?)\}:\1)/m
+          puts "#{$1}:{ #{$2} }:#{$1}"
+        end
+      end
+      def if_pair_sc
+        if @para=~/;\{\s*(.+?)\s*\};([a-z]+(?:[_:.][a-z]+)*)/
+          puts ";{ #{$1} };#{$2}"
+        end
+      end
+      def match_pair_c
+        matched=[]
+        matched=rgx.pair_c.match(@para)[1] if @para =~ rgx.pair_c
+        puts matched unless matched.nil?
+      end
+      def match_pair_sc
+        matched=[]
+        matched=rgx.pair_sc.match(@para)[1] if @para =~ rgx.pair_sc
+        puts matched unless matched.nil?
+      end
+      def matching
+        scan_pair_c
+      end
+      self
+    end
+    def rm
+      def sem_marker_parts
+        unless @para =~ rgx.exclude
+          @para.gsub!(rgx.each_csc,'')
+        end
+        @para
+      end
+      def sem_marker_added_extra_parts
+        unless @para =~ rgx.exclude
+          @para.gsub!(rgx.whole_csc_ae,'')
+          if @para =~rgx.each_csc_ae
+            STDERR.puts "WARNING semantic tagging error: #{@para}"
+          end
+        end
+        @para
+      end
+      def all
+        if @md.sem_tag
+          sem_marker_parts
+          sem_marker_added_extra_parts
+        end
+        @para
+      end
+      self
+    end
+  end
+end
+__END__