diff --git a/shared/python/MBGF.py b/shared/python/MBGF.py
index 99f1305b..2cebfe41 100755
--- a/shared/python/MBGF.py
+++ b/shared/python/MBGF.py
@@ -4,14 +4,26 @@
 import slpsns, BGF3
 import xml.etree.ElementTree as ET
 
+cx = {}
+
 class TopModel:
+	def getData(self, id):
+		if id in self.data.keys():
+			return self.data[id]
+		else:
+			return ''
 	def who(self):
 		return self.__class__.__name__
 	def parsebasic(self, xml):
+		global cx
 		if 'id' in xml.attrib:
 			self.id = xml.attrib['id']
 		else:
-			self.id = self.who()
+			if self.who() in cx:
+				cx[self.who()] += 1
+			else:
+				cx[self.who()] = 1
+			self.id = self.who()+str(cx[self.who()])
 		if 'depends' in xml.attrib:
 			self.depends = xml.attrib['depends']
 		else:
@@ -26,6 +38,27 @@ def parse(self, xml):
 				self.data[s] = ss.text
 
 class SrcProdModel (TopModel):
+	def getNTs(self,id):
+		nts = []
+		for p in self.getProds(id):
+			if p.nt not in nts:
+				nts.append(p.nt)
+		return nts
+	def getProds(self,id):
+		if id in self.data.keys():
+			return self.data[id][0]
+		else:
+			return []
+	def getScope(self,id):
+		if id in self.data.keys():
+			return self.data[id][1]
+		else:
+			return []
+	def getData(self, id):
+		if id in self.data.keys():
+			return '; '.join(map(str,self.data[id][0])).replace(':\n        ',' ← ')
+		else:
+			return '∅'
 	def parse(self, xml):
 		self.parsebasic(xml)
 		for ss in xml.findall('src'):
@@ -35,7 +68,7 @@ def parse(self, xml):
 					xp = BGF3.Production()
 					xp.parse(p)
 					self.data[s][0].append(xp)
-				self.data[s][1] = xml.findall('in')
+				self.data[s][1] = ss.findall('in/*')
 
 #
 # <sources>
@@ -56,6 +89,21 @@ class NamingConvention (SrcSimpleModel):
 	def __init__(self, xml):
 		self.default = xml.findtext('default')
 		self.parse(xml)
+	def getSpecifics(self):
+		return self.default
+	
+# <name-bind>
+# 	<name>function</name>
+# 	<src name="dcg">function</src>
+# 	<src name="sdf,rsc">Function</src>
+# </name-bind>
+class NameBind (SrcSimpleModel):
+	def __init__(self, xml):
+		self.nt = xml.findtext('name')
+		self.parse(xml)
+	def getSpecifics(self):
+		return self.nt
+	
 
 # <width>
 # 	<bgf:expression>
@@ -74,6 +122,8 @@ def __init__(self, xml):
 		# apply namemap!!!
 		self.parse(xml)
 		self.scope = xml.findall('in')
+	def getSpecifics(self):
+		return str(self.expr)	
 
 # <unification>
 # 	<nonterminal>expr</nonterminal>
@@ -87,6 +137,8 @@ class Unification (SrcProdModel):
 	def __init__(self, xml):
 		self.nt = xml.findtext('nonterminal')
 		self.parse(xml)
+	def getSpecifics(self):
+		return 'n('+self.nt+')'
 
 # <iteration>
 # 	<label>binary</label>
@@ -101,3 +153,5 @@ def __init__(self, xml):
 		self.nt = xml.findtext('name')
 		self.sep = xml.findtext('separator')
 		self.parse(xml)
+	def getSpecifics(self):
+		return ', '.join(('['+self.label+']','n('+self.nt+')','n('+self.sep+')'))
diff --git a/topics/convergence/tri/m2 b/topics/convergence/tri/m2
index cd66db84..aefb895a 100755
--- a/topics/convergence/tri/m2
+++ b/topics/convergence/tri/m2
@@ -1,11 +1,20 @@
 #!/bin/sh
 
+# m2 file.mbgf one two
+# $0    $1     $2  $3
+./mbgf2xbgf.py $1 $2 $3 tmp.xbgf
+xbgf tmp.xbgf `xpath $1 'mbgf:sequence/sources/src[@name="'$2'"]/text()' 2> /dev/null` tmp1.bgf
+gdts tmp1.bgf `xpath $1 'mbgf:sequence/sources/src[@name="'$3'"]/text()' 2> /dev/null`
+rm tmp.xbgf
+./mbgf2xbgf.py $1 $3 $2 tmp.xbgf
+xbgf tmp.xbgf `xpath $1 'mbgf:sequence/sources/src[@name="'$3'"]/text()' 2> /dev/null` tmp2.bgf
+gdts tmp2.bgf `xpath $1 'mbgf:sequence/sources/src[@name="'$2'"]/text()' 2> /dev/null`
 # m2 file.mbgf 1 one.bgf 2 two.bgf
 # $0    $1    $2    $3   $4    $5
-./mbgf2xbgf.py $1 $2 $4 tmp.xbgf
-xbgf tmp.xbgf $3 $3.tmp
-gdts $3.tmp $5
-rm tmp.xbgf
-./mbgf2xbgf.py $1 $4 $2 tmp.xbgf
-xbgf tmp.xbgf $5 $5.tmp
-gdts $5.tmp $3
+# ./mbgf2xbgf.py $1 $2 $4 tmp.xbgf
+# xbgf tmp.xbgf $3 $3.tmp
+# gdts $3.tmp $5
+# rm tmp.xbgf
+# ./mbgf2xbgf.py $1 $4 $2 tmp.xbgf
+# xbgf tmp.xbgf $5 $5.tmp
+# gdts $5.tmp $3
diff --git a/topics/convergence/tri/mbgf2xbgf.py b/topics/convergence/tri/mbgf2xbgf.py
index 8d1df352..65af2095 100755
--- a/topics/convergence/tri/mbgf2xbgf.py
+++ b/topics/convergence/tri/mbgf2xbgf.py
@@ -20,7 +20,7 @@ def applynamemap(e):
 	sys.exit(1)
 
 def wrapexp(exp,mod):
-	if mod=='1':
+	if mod=='!':
 		return str(exp)
 	else:
 		return str(exp)+mod
@@ -47,6 +47,8 @@ def wrapexp(exp,mod):
 				# 	sources[s.attrib['name']] = s.text
 			elif e.tag=='naming-convention':
 				predicates.append(MBGF.NamingConvention(e))
+			elif e.tag=='name-bind':
+				predicates.append(MBGF.NameBind(e))
 			elif e.tag=='width':
 				predicates.append(MBGF.Width(e))
 			elif e.tag=='unification':
@@ -81,8 +83,198 @@ def wrapexp(exp,mod):
 				sys.exit(2)
 		print('Scheduled order:',scheduled)
 		for id in scheduled:
-			pass
-
+			p = pbyid[id]
+			print('[MBGF]',p.who(),'(',p.getSpecifics(),',',p.getData(inname),',',p.getData(outname),')', end=' ::= ')
+			if p.who() == 'NamingConvention':
+				if p.getData(inname) == p.getData(outname):
+					print('id')
+				else:
+					print('mutation TODO')
+			elif p.who() == 'NameBind':
+				n1 = p.getData(inname)
+				n2 = p.getData(outname)
+				namemap[p.nt] = n2
+				if n1 == n2:
+					print('id')
+				else:
+					print('renameN(',n1,',',n2,')')
+					ren = XBGF3.Step('rename')
+					w = XBGF3.Wrapping('nonterminal')
+					w.addChild(XBGF3.Leaf('from',n1))
+					w.addChild(XBGF3.Leaf('to',n2))
+					ren.addParam(w)
+					xbgf.addStep(ren)
+			elif p.who() == 'Width':
+				exp = p.expr
+				applynamemap(exp)
+				e1 = p.getData(inname)
+				e2 = p.getData(outname)
+				i = p.scope # TODO
+				yes = False
+				if e1==e2:
+					print('id')
+				elif (e1,e2) in [('*','+'),('*','?'),('*','!'),('+','!'),('?','!')]:
+					ren = XBGF3.Step('narrow')
+					yes = True
+				elif (e2,e1) in [('*','+'),('*','?'),('*','!'),('+','!'),('?','!')]:
+					ren = XBGF3.Step('widen')
+					yes = True
+				else:
+					print('ERROR: not in narrowing relation!')
+					sys.exit(1)
+				if yes:
+					print(ren.name+'('+wrapexp(exp,e1)+','+wrapexp(exp,e2)+')')
+					if e1=='!':
+						ren.addParam(exp)
+					elif e1=='+':
+						p = BGF3.Plus()
+						p.setExpr(exp)
+						ren.addParam(BGF3.Expression(p))
+					elif e1=='*':
+						p = BGF3.Star()
+						p.setExpr(exp)
+						ren.addParam(BGF3.Expression(p))
+					elif e1=='?':
+						p = BGF3.Optional()
+						p.setExpr(exp)
+						ren.addParam(BGF3.Expression(p))
+					else:
+						print('ERROR: unknown in modifier!')
+						sys.exit(1)
+					if e2=='!':
+						ren.addParam(exp)
+					elif e2=='+':
+						p = BGF3.Plus()
+						p.setExpr(exp)
+						ren.addParam(BGF3.Expression(p))
+					elif e2=='*':
+						p = BGF3.Star()
+						p.setExpr(exp)
+						ren.addParam(BGF3.Expression(p))
+					elif e2=='?':
+						p = BGF3.Optional()
+						p.setExpr(exp)
+						ren.addParam(BGF3.Expression(p))
+					else:
+						print('ERROR: unknown out modifier!')
+						sys.exit(1)
+					xbgf.addStep(ren)
+			elif p.who() == 'Unification':
+				n0 = p.nt
+				n1 = p.getNTs(inname)
+				n2 = p.getNTs(outname)
+				if n0 in namemap:
+					n3 = namemap[n0]
+				else:
+					n3 = n0
+				if n1:
+					# print('[MBGF] unification('+n1+','+n0+') ::= unite('+n1+','+n3+')')
+					print('unite('+n1[0]+','+n3+')')
+					ren = XBGF3.Step('unite')
+					ren.addParam(XBGF3.Leaf('add',n1[0]))
+					ren.addParam(XBGF3.Leaf('to',n3))
+					xbgf.addStep(ren)
+				elif n2:
+					# print('[MBGF] unification('+n2+','+n0+') ::= split('+n3+','+n0+')')
+					print('split('+n3+','+n0+')')
+					ren = XBGF3.Step('split')
+					ren.addParam(XBGF3.Leaf('nonterminal',n3))
+					for q in p.getProds(outname):
+						ren.addParam(q)
+					for l in p.getScope(outname):
+						ren.addParam(BGF3.LabelText(l.text))
+					# print('!!!',e.findall('add')[outnum-1].attrib)
+					# ren.addParam(XBGF3.Leaf('to',n3))
+					xbgf.addStep(ren)
+				else:
+					# TODO: check for the situation when both n1 and n2 are not empty
+					# print('[MBGF] unification(∅,'+n2+') ::= id')
+					print('id')
+			elif p.who() == 'Iteration':
+				l = p.label
+				n = p.nt
+				s = p.sep
+				k1 = p.getData(inname)
+				k2 = p.getData(outname)
+				if k1==k2:
+					# print('[MBGF] iteration('+l+','+n+','+s+','+k1+','+k2+') ::= id')
+					print('id')
+				elif k1=='iterate' and k2.endswith('assoc'):
+					if n in namemap:
+						n1 = namemap[n]
+					else:
+						n1 = n
+					if s in namemap:
+						s1 = namemap[s]
+					else:
+						s1 = s
+					# print('[MBGF] iteration('+l+','+n+','+s+','+k1+','+k2+') ::= '+k2+'(['+l+'] '+n1+' ← '+n1+' '+s1+' '+n1+')')
+					print(k2+'(['+l+'] '+n1+' ← '+n1+' '+s1+' '+n1+')')
+					ren = XBGF3.Step(k2)
+					p = BGF3.Production()
+					p.setLabel(l)
+					p.setNT(n1)
+					e = BGF3.Sequence()
+					e2 = BGF3.Nonterminal()
+					e2.setName(n1)
+					e.add(BGF3.Expression(e2))
+					if s:
+						e2 = BGF3.Nonterminal()
+						e2.setName(s1)
+						e.add(BGF3.Expression(e2))
+					e2 = BGF3.Nonterminal()
+					e2.setName(n1)
+					e.add(BGF3.Expression(e2))
+					p.setExpr(BGF3.Expression(e))
+					ren.addParam(p)
+					xbgf.addStep(ren)
+				elif k1.endswith('assoc') and k2=='iterate':
+					if n in namemap:
+						n1 = namemap[n]
+					else:
+						n1 = n
+					if s in namemap:
+						s1 = namemap[s]
+					else:
+						s1 = s
+					if s1:
+						ass = n1+' ('+s1+' '+n1+')*'
+					else:
+						ass = n1+'+'
+					# print('[MBGF] iteration('+l+','+n+','+s+','+k1+','+k2+') ::= iterate(['+l+'] '+n1+' ← '+ass+')')
+					print('iterate(['+l+'] '+n1+' ← '+ass+')')
+					ren = XBGF3.Step('iterate')
+					p = BGF3.Production()
+					p.setLabel(l)
+					p.setNT(n1)
+					if s1:
+						# N (S N)*
+						e = BGF3.Sequence()
+						e2 = BGF3.Nonterminal()
+						e2.setName(n1)
+						e.add(BGF3.Expression(e2))
+						e3 = BGF3.Sequence()
+						e4 = BGF3.Nonterminal()
+						e4.setName(s1)
+						e3.add(BGF3.Expression(e4))
+						e3.add(BGF3.Expression(e2))
+						e5 = BGF3.Star()
+						e5.setExpr(BGF3.Expression(e3))
+						e.add(BGF3.Expression(e5))
+					else:
+						# N+
+						e = BGF3.Plus()
+						e2 = BGF3.Nonterminal()
+						e2.setName(n1)
+						e.setExpr(BGF3.Expression(e2))
+					p.setExpr(BGF3.Expression(e))
+					ren.addParam(p)
+					xbgf.addStep(ren)
+				else:
+					print('PROBLEM')
+					sys.exit(1)
+			else:
+				print('UNKNOWN COMMAND')
 		ET.ElementTree(xbgf.getXml()).write(sys.argv[4])
 		print('Success',predicates)
         
\ No newline at end of file
diff --git a/topics/convergence/tri/test.mbgf b/topics/convergence/tri/test.mbgf
index 30d70d00..108a9f11 100644
--- a/topics/convergence/tri/test.mbgf
+++ b/topics/convergence/tri/test.mbgf
@@ -5,12 +5,20 @@
 		<src name="sdf">snapshot/sdf.bgf</src>
 		<src name="rsc">snapshot/rascal.bgf</src>
 	</sources>
-	<naming-convention>
-		<default>l!</default>
-		<src name="dcg">l!</src>
-		<src name="sdf,rsc">C!</src>
-	</naming-convention>
+	<!-- <naming-convention>
+		<default>l_</default>
+		<src name="dcg">l_</src>
+		<src name="sdf,rsc">C_</src>
+	</naming-convention> -->
 	<!-- should be possible to do individual name bindings -->
+	<name-bind><name>program</name><src name="dcg">program</src><src name="sdf,rsc">Program</src></name-bind>
+	<name-bind><name>function</name><src name="dcg">function</src><src name="sdf,rsc">Function</src></name-bind>
+	<name-bind><name>expr</name><src name="dcg">expr</src><src name="sdf,rsc">Expr</src></name-bind>
+	<name-bind><name>name</name><src name="dcg">name</src><src name="sdf,rsc">Name</src></name-bind>
+	<name-bind><name>newline</name><src name="dcg">newline</src><src name="sdf,rsc">Newline</src></name-bind>
+	<name-bind><name>int</name><src name="dcg">int</src><src name="sdf,rsc">Int</src></name-bind>
+	<name-bind><name>ops</name><src name="dcg">ops</src><src name="sdf,rsc">Ops</src></name-bind>
+	
 	<width>
 		<bgf:expression>
 			<nonterminal>newline</nonterminal>