diff --git a/shared/prolog/readXbgf.pro b/shared/prolog/readXbgf.pro
index 329d050b..de663af4 100644
--- a/shared/prolog/readXbgf.pro
+++ b/shared/prolog/readXbgf.pro
@@ -48,6 +48,11 @@ xml2xbgf(T,deyaccify(N))
     self(name(xbgf:deyaccify),T),
     content(T,N).
 
+xml2xbgf(T,unterminalize(N))
+ :-
+    self(name(xbgf:unterminalize),T),
+    content(T,N).
+
 xml2xbgf(T,distributeL(L))
  :-
     self(name(xbgf:distribute),T),
@@ -309,11 +314,12 @@ xml2xbgf(T,verticalN(N))
     child(name(nonterminal),T,T1),
     content(T1,N).
 
-xml2xbgf(T,yaccify(P2))
+xml2xbgf(T,yaccify(P1,P2))
  :-
     self(name(xbgf:yaccify),T),
-    child(name(bgf:production),T,P1),
-    xmlToP(P1,P2).
+    children(name(bgf:production),T,[P3,P4]),
+    xmlToP(P3,P1),
+    xmlToP(P4,P2).
 
 xml2xbgf(T,G)
  :-
diff --git a/shared/prolog/xbgf1.pro b/shared/prolog/xbgf1.pro
index a5e0ea58..4547e714 100644
--- a/shared/prolog/xbgf1.pro
+++ b/shared/prolog/xbgf1.pro
@@ -1083,6 +1083,22 @@ abridge(P1,g(Rs,Ps1),g(Rs,Ps2))
       [P1]),
     append(Ps1a,Ps1b,Ps2).
 
+%
+% p([l(unterminalize)], f, n(p))
+%
+% Strip all terminals within a given nonterminal's definition
+%
+
+unterminalize(N,g(Rs,Ps1),g(Rs,Ps2))
+ :- 
+    usedNs(Ps1,Uses1),
+    require(
+      member(N,Uses1),
+      'Nonterminal ~q must be used.',
+      [N]),
+    splitN(Ps1,N,Ps0,Ps2a,Ps2b),
+    transform(try(xbgf1:stripTs_rule),g(Rs,Ps0),g(Rs,Ps3)),
+    concat([Ps2a,Ps3,Ps2b],Ps2).
 
 %
 % p([l(stripL)], f, n(l))
@@ -1360,13 +1376,14 @@ widen(X1,X2,Ps2,Ps2a,Ps2b,Ps3)
 % Expand EBNF-based regular expression operator via BNF encoding
 %
 
-yaccify(P1,g(Rs,Ps1),g(Rs,Ps2))
+yaccify(P1,P2,g(Rs,Ps1),g(Rs,Ps3))
  :-
-    P1 = p(As,N,X1),
-    splitN1(Ps1,N,P2,Ps2a,Ps2b),
-    P2 = p(As,N,X2),
+    P1 = p(As,N,_),	
+    P2 = p(As,N,_),
+    splitN1(Ps1,N,P3,Ps2a,Ps2b),
+    P3 = p(As,N,_),
     require(
-      xbgf1:deyaccify_rules(N,X1,X2),
-      '~q and ~q not suitable for yaccification.',
-      [X1,X2]),
-    append(Ps2a,[P1|Ps2b],Ps2).
+      xbgf1:newdeyaccify_rules(N,P1,P2,P3),
+      '~q and ~q not suitable as yaccification of ~q.',
+      [P1,P2,P3]),
+    append(Ps2a,[P1,P2|Ps2b],Ps3).
diff --git a/shared/xsd/xbgf.xsd b/shared/xsd/xbgf.xsd
index 52a002eb..6ac6b62d 100644
--- a/shared/xsd/xbgf.xsd
+++ b/shared/xsd/xbgf.xsd
@@ -63,6 +63,7 @@
       <xsd:element ref="xbgf:undefine"/>
       <xsd:element ref="xbgf:unfold"/>
       <xsd:element ref="xbgf:unite"/>
+      <xsd:element ref="xbgf:unterminalize"/>
       <xsd:element ref="xbgf:vertical"/>
       <xsd:element ref="xbgf:widen"/>
       <xsd:element ref="xbgf:yaccify"/>
@@ -743,6 +744,16 @@
       </xsd:sequence>
     </xsd:complexType>
   </xsd:element>
+  
+  <xsd:element name="unterminalize" type="bgf:nonterminal">
+    <xsd:annotation>
+      <xsd:documentation>
+        Various details of productions can be required to be stripped.
+        This transformation strips all terminal symbols
+        within a given nonterminal's definition.
+      </xsd:documentation>
+    </xsd:annotation>
+  </xsd:element>
 
   <xsd:element name="vertical">
     <xsd:annotation>
@@ -796,6 +807,7 @@
     <xsd:complexType>
       <xsd:sequence>
         <xsd:element ref="bgf:production"/>
+        <xsd:element ref="bgf:production"/>
       </xsd:sequence>
     </xsd:complexType>
   </xsd:element>
diff --git a/topics/java/lci/xbgf/extendModifiers.xbgf b/topics/java/lci/xbgf/extendModifiers.xbgf
index 465827b8..fa3c7a3c 100644
--- a/topics/java/lci/xbgf/extendModifiers.xbgf
+++ b/topics/java/lci/xbgf/extendModifiers.xbgf
@@ -220,21 +220,20 @@
     <bgf:production>
       <nonterminal>ConstantModifiers</nonterminal>
       <bgf:expression>
-        <choice>
+        <nonterminal>ConstantModifier</nonterminal>
+      </bgf:expression>
+    </bgf:production>
+    <bgf:production>
+      <nonterminal>ConstantModifiers</nonterminal>
+      <bgf:expression>
+        <sequence>
           <bgf:expression>
             <nonterminal>ConstantModifier</nonterminal>
           </bgf:expression>
           <bgf:expression>
-            <sequence>
-              <bgf:expression>
-                <nonterminal>ConstantModifier</nonterminal>
-              </bgf:expression>
-              <bgf:expression>
-                <nonterminal>ConstantModifiers</nonterminal>
-              </bgf:expression>
-            </sequence>
+            <nonterminal>ConstantModifiers</nonterminal>
           </bgf:expression>
-        </choice>
+        </sequence>
       </bgf:expression>
     </bgf:production>
   </xbgf:yaccify>
diff --git a/topics/transformation/xbgf/tests/Makefile b/topics/transformation/xbgf/tests/Makefile
index a80b903f..de3eaa28 100644
--- a/topics/transformation/xbgf/tests/Makefile
+++ b/topics/transformation/xbgf/tests/Makefile
@@ -71,7 +71,6 @@ test:
 	@make strip3.quiet
 	@make strip4.quiet
 	@make strip5.quiet
-	@make strip6.quiet
 	@make unchain.quiet
 	@make undefine.quiet
 	@make unfold1.quiet
@@ -79,6 +78,7 @@ test:
 	@make unfold3.quiet
 	@make unfold4.quiet
 	@make unite.quiet
+	@make unterminalize.quiet
 	@make vertical1.quiet
 	@make vertical2.quiet
 	@make widen1.quiet
diff --git a/topics/transformation/xbgf/tests/strip6.baseline b/topics/transformation/xbgf/tests/strip6.baseline
deleted file mode 100644
index bfaea9c9..00000000
--- a/topics/transformation/xbgf/tests/strip6.baseline
+++ /dev/null
@@ -1,57 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<xns1:grammar xmlns:xns1="http://planet-sl.org/bgf">
-  <xns1:production>
-    <label>constant</label>
-    <nonterminal>expr</nonterminal>
-    <xns1:expression>
-      <selectable>
-	<selector>value</selector>
-	<xns1:expression>
-	  <nonterminal>int</nonterminal>
-	</xns1:expression>
-      </selectable>
-    </xns1:expression>
-  </xns1:production>
-  <xns1:production>
-    <label>binary</label>
-    <nonterminal>expr</nonterminal>
-    <xns1:expression>
-      <sequence>
-	<xns1:expression>
-	  <nonterminal>expr</nonterminal>
-	</xns1:expression>
-	<xns1:expression>
-	  <selectable>
-	    <selector>op</selector>
-	    <xns1:expression>
-	      <nonterminal>binary_op</nonterminal>
-	    </xns1:expression>
-	  </selectable>
-	</xns1:expression>
-	<xns1:expression>
-	  <nonterminal>expr</nonterminal>
-	</xns1:expression>
-      </sequence>
-    </xns1:expression>
-  </xns1:production>
-  <xns1:production>
-    <label>unary</label>
-    <nonterminal>expr</nonterminal>
-    <xns1:expression>
-      <sequence>
-	<xns1:expression>
-	  <selectable>
-	    <selector>op</selector>
-	    <xns1:expression>
-	      <nonterminal>unary_op</nonterminal>
-	    </xns1:expression>
-	  </selectable>
-	</xns1:expression>
-	<xns1:expression>
-	  <nonterminal>expr</nonterminal>
-	</xns1:expression>
-      </sequence>
-    </xns1:expression>
-  </xns1:production>
-</xns1:grammar>
\ No newline at end of file
diff --git a/topics/transformation/xbgf/tests/unterminalize.baseline b/topics/transformation/xbgf/tests/unterminalize.baseline
new file mode 100644
index 00000000..3bccc94d
--- /dev/null
+++ b/topics/transformation/xbgf/tests/unterminalize.baseline
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<bgf:grammar xmlns:bgf="http://planet-sl.org/bgf">
+  <bgf:production>
+    <label>constant</label>
+    <nonterminal>expr</nonterminal>
+    <bgf:expression>
+      <selectable>
+        <selector>value</selector>
+        <bgf:expression>
+          <nonterminal>int</nonterminal>
+        </bgf:expression>
+      </selectable>
+    </bgf:expression>
+  </bgf:production>
+  <bgf:production>
+    <label>binary</label>
+    <nonterminal>expr</nonterminal>
+    <bgf:expression>
+      <sequence>
+        <bgf:expression>
+          <nonterminal>expr</nonterminal>
+        </bgf:expression>
+        <bgf:expression>
+          <selectable>
+            <selector>op</selector>
+            <bgf:expression>
+              <nonterminal>binary_op</nonterminal>
+            </bgf:expression>
+          </selectable>
+        </bgf:expression>
+        <bgf:expression>
+          <nonterminal>expr</nonterminal>
+        </bgf:expression>
+      </sequence>
+    </bgf:expression>
+  </bgf:production>
+  <bgf:production>
+    <label>unary</label>
+    <nonterminal>expr</nonterminal>
+    <bgf:expression>
+      <sequence>
+        <bgf:expression>
+          <selectable>
+            <selector>op</selector>
+            <bgf:expression>
+              <nonterminal>unary_op</nonterminal>
+            </bgf:expression>
+          </selectable>
+        </bgf:expression>
+        <bgf:expression>
+          <nonterminal>expr</nonterminal>
+        </bgf:expression>
+      </sequence>
+    </bgf:expression>
+  </bgf:production>
+  <bgf:production>
+    <nonterminal>nonexpr</nonterminal>
+    <bgf:expression>
+      <terminal>test</terminal>
+    </bgf:expression>
+  </bgf:production>
+</bgf:grammar>
\ No newline at end of file
diff --git a/topics/transformation/xbgf/tests/strip6.bgf b/topics/transformation/xbgf/tests/unterminalize.bgf
similarity index 90%
rename from topics/transformation/xbgf/tests/strip6.bgf
rename to topics/transformation/xbgf/tests/unterminalize.bgf
index cf434d0f..2feb1d2b 100644
--- a/topics/transformation/xbgf/tests/strip6.bgf
+++ b/topics/transformation/xbgf/tests/unterminalize.bgf
@@ -58,4 +58,10 @@
       </sequence>
     </bgf:expression>
   </bgf:production>
-</bgf:grammar>
+  <bgf:production>
+    <nonterminal>nonexpr</nonterminal>
+    <bgf:expression>
+      <terminal>test</terminal>
+    </bgf:expression>
+  </bgf:production>
+</bgf:grammar>
\ No newline at end of file
diff --git a/topics/transformation/xbgf/tests/strip6.xbgf b/topics/transformation/xbgf/tests/unterminalize.xbgf
similarity index 68%
rename from topics/transformation/xbgf/tests/strip6.xbgf
rename to topics/transformation/xbgf/tests/unterminalize.xbgf
index c39e9759..4d849e0b 100644
--- a/topics/transformation/xbgf/tests/strip6.xbgf
+++ b/topics/transformation/xbgf/tests/unterminalize.xbgf
@@ -1,7 +1,5 @@
 <xbgf:sequence
   xmlns:bgf="http://planet-sl.org/bgf"
   xmlns:xbgf="http://planet-sl.org/xbgf">
-  <xbgf:strip>
-    <allTerminals/>
-  </xbgf:strip>
+  <xbgf:unterminalize>expr</xbgf:unterminalize>
 </xbgf:sequence>