diff --git a/relaxng/all_compact.rnc b/relaxng/all_compact.rnc
index 41f71d24..d7182499 100644
--- a/relaxng/all_compact.rnc
+++ b/relaxng/all_compact.rnc
@@ -89,7 +89,7 @@ include "modules/termseq_unbin_expansion_module.rnc" inherit = ruleml {start |=
 include "modules/type_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #include "modules/unordered_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #include "modules/unordered_deterministic_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_attrib_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_non-default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
diff --git a/relaxng/all_ordered.rnc b/relaxng/all_ordered.rnc
index 16f7b4d4..3d008ff7 100644
--- a/relaxng/all_ordered.rnc
+++ b/relaxng/all_ordered.rnc
@@ -104,7 +104,7 @@ include "modules/termseq_unbin_expansion_module.rnc" inherit = ruleml {start |=
 include "modules/type_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #include "modules/unordered_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #include "modules/unordered_deterministic_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_attrib_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_non-default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
diff --git a/relaxng/all_unordered.rnc b/relaxng/all_unordered.rnc
index 904daad5..c72296ae 100644
--- a/relaxng/all_unordered.rnc
+++ b/relaxng/all_unordered.rnc
@@ -104,7 +104,7 @@ include "modules/termseq_unbin_expansion_module.rnc" inherit = ruleml {start |=
 include "modules/type_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/unordered_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #include "modules/unordered_deterministic_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_attrib_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_non-default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
diff --git a/relaxng/all_unordered_deterministic.rnc b/relaxng/all_unordered_deterministic.rnc
index 4763b37c..7fb31a73 100644
--- a/relaxng/all_unordered_deterministic.rnc
+++ b/relaxng/all_unordered_deterministic.rnc
@@ -104,7 +104,7 @@ include "modules/termseq_unbin_expansion_module.rnc" inherit = ruleml {start |=
 include "modules/type_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #include "modules/unordered_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/unordered_deterministic_groups_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_attrib_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 include "modules/val_non-default_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
diff --git a/relaxng/indep_valid_modules/oriented_default_expansion_module.rnc b/relaxng/indep_valid_modules/oriented_default_expansion_module.rnc
index 1e82e919..67e1de5a 100644
--- a/relaxng/indep_valid_modules/oriented_default_expansion_module.rnc
+++ b/relaxng/indep_valid_modules/oriented_default_expansion_module.rnc
@@ -1,2 +1,2 @@
-include "../modules/oriented_default_expansion_module.rnc"
-include "../modules/init_expansion_module.rnc"
+include "../modules/oriented_default_expansion_module.rnc"
+include "../modules/init_expansion_module.rnc"
diff --git a/relaxng/indep_valid_modules/oriented_non-default_expansion_module.rnc b/relaxng/indep_valid_modules/oriented_non-default_expansion_module.rnc
index db95dab9..60e60abc 100644
--- a/relaxng/indep_valid_modules/oriented_non-default_expansion_module.rnc
+++ b/relaxng/indep_valid_modules/oriented_non-default_expansion_module.rnc
@@ -1,2 +1,2 @@
-include "../modules/oriented_non-default_expansion_module.rnc"
-include "../modules/init_expansion_module.rnc"
+include "../modules/oriented_non-default_expansion_module.rnc"
+include "../modules/init_expansion_module.rnc"
diff --git a/relaxng/indep_valid_modules/val_non-default_expansion_module.rnc b/relaxng/indep_valid_modules/val_non-default_expansion_module.rnc
index 1282be05..011c610b 100644
--- a/relaxng/indep_valid_modules/val_non-default_expansion_module.rnc
+++ b/relaxng/indep_valid_modules/val_non-default_expansion_module.rnc
@@ -1,2 +1,2 @@
-include "../modules/val_non-default_expansion_module.rnc"
-include "../modules/init_expansion_module.rnc"
+include "../modules/val_non-default_expansion_module.rnc"
+include "../modules/init_expansion_module.rnc"
diff --git a/relaxng/indep_valid_modules/xml_lang_expansion_module.rnc b/relaxng/indep_valid_modules/xml_lang_expansion_module.rnc
index 3d388adb..8c60bfcd 100644
--- a/relaxng/indep_valid_modules/xml_lang_expansion_module.rnc
+++ b/relaxng/indep_valid_modules/xml_lang_expansion_module.rnc
@@ -1,2 +1,2 @@
-include "../modules/xml_lang_expansion_module.rnc"
-include "../modules/init_expansion_module.rnc"
+include "../modules/xml_lang_expansion_module.rnc"
+include "../modules/init_expansion_module.rnc"
diff --git a/relaxng/modules/val_attrib_expansion_module.rnc b/relaxng/modules/val_attrib_expansion_module.rnc
index cb7ddc1e..e1f88a80 100644
--- a/relaxng/modules/val_attrib_expansion_module.rnc
+++ b/relaxng/modules/val_attrib_expansion_module.rnc
@@ -22,7 +22,7 @@ singlevalued-att.choice |= val.attrib.def
 val.attrib.def =
   #
   
-  ## This attribute is used to indicate whether a function (<Fun>) is deterministic or non-deterministic. 
+  ## An attribute indicating whether a function (<Fun>) is deterministic or non-deterministic. 
   ## It has two values: "1" (deterministic: exactly one) and "0.." (set-valued: zero or more).    
   ## See http://deliberation.ruleml.org/1.02/glossary/.40val
   attribute val { val.value }
diff --git a/relaxng/naffologeq_compact.rnc b/relaxng/naffologeq_compact.rnc
index fec8bea2..1e85ff2e 100644
--- a/relaxng/naffologeq_compact.rnc
+++ b/relaxng/naffologeq_compact.rnc
@@ -331,9 +331,9 @@ include "modules/plex_expansion_module.rnc" inherit = ruleml {
 # 
 # SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL
 #
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {
-  start |= notAllowed
-}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {
+#  start |= notAllowed
+#}
 # 
 # SET-VALUED EXPRESSION ATTRIBUTE IS INCLUDED
 #
diff --git a/relaxng/naffologeq_compact4simp.rnc b/relaxng/naffologeq_compact4simp.rnc
index 803c5093..9c5a9884 100644
--- a/relaxng/naffologeq_compact4simp.rnc
+++ b/relaxng/naffologeq_compact4simp.rnc
@@ -327,9 +327,9 @@ include "modules/plex_expansion_module.rnc" inherit = ruleml {
 # 
 # SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL
 #
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {
-  start |= notAllowed
-}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {
+#  start |= notAllowed
+#}
 # 
 # SET-VALUED EXPRESSION ATTRIBUTE IS INCLUDED
 #
diff --git a/relaxng/naffologeq_compact4xsd.rnc b/relaxng/naffologeq_compact4xsd.rnc
index ef6a8f4c..74c96c35 100644
--- a/relaxng/naffologeq_compact4xsd.rnc
+++ b/relaxng/naffologeq_compact4xsd.rnc
@@ -325,9 +325,9 @@ include "modules/plex_expansion_module.rnc" inherit = ruleml {
 # 
 # SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL
 #
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {
-  start |= notAllowed
-}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {
+#  start |= notAllowed
+#}
 # 
 # SET-VALUED EXPRESSION ATTRIBUTE IS INCLUDED
 #
diff --git a/relaxng/naffologeq_ifthen-compact.rnc b/relaxng/naffologeq_ifthen-compact.rnc
index f18e4a5e..f2d816ee 100644
--- a/relaxng/naffologeq_ifthen-compact.rnc
+++ b/relaxng/naffologeq_ifthen-compact.rnc
@@ -222,7 +222,7 @@ include "modules/plex_expansion_module.rnc" inherit = ruleml {start |= notAllowe
 #
 # SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL
 #
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #
 # SET-VALUED EXPRESSION ATTRIBUTE IS INCLUDED
 #
diff --git a/relaxng/naffologeq_ifthen-compact4xsd.rnc b/relaxng/naffologeq_ifthen-compact4xsd.rnc
index 95d3cd7d..33037de4 100644
--- a/relaxng/naffologeq_ifthen-compact4xsd.rnc
+++ b/relaxng/naffologeq_ifthen-compact4xsd.rnc
@@ -220,7 +220,7 @@ include "modules/plex_expansion_module.rnc" inherit = ruleml {start |= notAllowe
 #
 # SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL
 #
-include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
+#include "modules/val_absence_expansion_module.rnc" inherit = ruleml {start |= notAllowed}
 #
 # SET-VALUED EXPRESSION ATTRIBUTE IS INCLUDED
 #
diff --git a/relaxng/schema_rnc.php b/relaxng/schema_rnc.php
index 934070b8..eefd9d2d 100644
--- a/relaxng/schema_rnc.php
+++ b/relaxng/schema_rnc.php
@@ -88,7 +88,7 @@
 $quantParam = "x".dechex(bindec($bquant));
 //
 $expr = "expr";
-$expr_val_absent = 0;
+//$expr_val_absent = 0;
 $expr_plex = 1;
 $expr_val_nondefault = 2;
 $expr_in = 3;
@@ -320,7 +320,7 @@
   $needResl = extractBit($bquant, $quant_resl);
   $enableRepo = extractBit($bquant, $quant_repo);
   
-  $enableValAbsent = extractBit($bexpr, $expr_val_absent);
+  //$enableValAbsent = extractBit($bexpr, $expr_val_absent);
   $enablePlex = extractBit($bexpr, $expr_plex);
   $enableValND = extractBit($bexpr, $expr_val_nondefault);
   $NeedValND = $enableValND;
@@ -795,11 +795,11 @@
     }
 
   // Include empty initialization of set-valued attribute if needed
-  if ( $enableValAbsent ){
-      echo "#\n# SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL\n";
-      echo "#\n".'include "' . $modulesLocation .
-          'val_absence_expansion_module.rnc"'."$end\n";
-  }  
+//  if ( $enableValAbsent ){
+//      echo "#\n# SET-VALUED EXPRESSION ATTRIBUTE IS ABSENT OR OPTIONAL\n";
+//      echo "#\n".'include "' . $modulesLocation .
+//          'val_absence_expansion_module.rnc"'."$end\n";
+//  }  
   // Include set-valued expression attribute if needed
  if ($needValAtt){
     echo "#\n# SET-VALUED EXPRESSION ATTRIBUTE IS INCLUDED\n";
diff --git a/test/rnc-test-suites/web-test-suite/naffologeq_curies_variants.ruleml b/test/rnc-test-suites/web-test-suite/naffologeq_curies_variants.ruleml
new file mode 100644
index 00000000..442fad9e
--- /dev/null
+++ b/test/rnc-test-suites/web-test-suite/naffologeq_curies_variants.ruleml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-model href="../../../relaxng/drivers/naffologeq_relaxed.rnc" 
+  type="application/relax-ng-compact-syntax"?>
+<RuleML xmlns="http://ruleml.org/spec"
+  xmlns:this="http://deliberation.ruleml.org/1.02/test/iri-test-suite/datalog_curies.ruleml"
+  xmlns:sort="http://example.org/ontology#"
+  xmlns:ext="http://example.org/ruleml-extension/vocab#"
+  xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <!-- dc:rights [ 'Copyright 2015 RuleML Inc. - Licensed under the RuleML Specification License, Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://ruleml.org/licensing/RSL1.0-RuleML. Disclaimer: THIS SPECIFICATION IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, ..., EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. See the License for the specifics governing permissions and limitations under the License.' ]-->
+  <!-- note the addition of the XML Schema namespace because a built-in datatype is used -->
+  <!-- a syntactic example rulebase for testing the Datalog RuleML sublanguage -->
+  <act index="1">
+    <Assert node="this:#assert1" mapClosure="ext:exists!" mapDirection="ext:greencut" mapMaterial="ext:intuitionistic">
+      <formula>
+        <Implies node="http://example.org#rule1" closure="ext:none" material="ext:indicative" direction="ext:cut">
+          <if>
+            <And>
+              <formula>
+                <Atom>
+                  <op><Rel iri="_:" node="this:#rel1">friend</Rel></op>
+                  <arg index=" 1"><Ind iri="d:e" node="e:f">Jane</Ind></arg>
+                  <arg index="2 "><Skolem node="this:#sk1">constant b</Skolem></arg>
+                  <arg index=" 3 "><Data xsi:type="xs:string">test</Data></arg>
+                  <arg index="4"><Data xsi:type="xs:integer">12</Data></arg>
+                  <arg index="5"><Data node="this:#data1" xsi:type="integer">12</Data></arg>
+                  <arg index="6"><Data node="this:#data2">12a <xs:integer/></Data></arg>
+                  <arg index="7"><Data>tomorrow</Data></arg>
+                  <arg index="8"><Data xsi:type="xs:dateTime">2002-10-10T17:00:00Z</Data></arg>
+                  <arg index="9"><Data>test12</Data></arg>
+                  <arg index="10"><Ind type="sort:person">Jack</Ind></arg>
+                  <arg index="11"><Var type="sort:car">y</Var></arg>
+                  <arg index="12"><Expr><Fun per="ext:lazy" val="ext:0..2"></Fun></Expr></arg>
+                </Atom>
+              </formula>
+            </And>
+          </if>
+          <then>
+            <Equal oriented="ext:reverse">
+              <Ind>a</Ind>
+              <Expr><Fun>f</Fun><Var>x</Var></Expr>
+            </Equal>
+          </then>
+        </Implies>
+      </formula>
+    </Assert>
+  </act>
+</RuleML>
\ No newline at end of file