diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index e69de29bb..6fbcc712c 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -0,0 +1,4 @@
+Validator:
+* allow for URLs that are references to ISO standards (urn:std:)
+* fix up validation of value set for code system and expansions
+* fix up validation for R2B issues (value set references, profiled types)
\ No newline at end of file
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java
index 17b33fb27..409a6d681 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/renderers/DataRenderer.java
@@ -400,8 +400,10 @@ public class DataRenderer extends Renderer {
       } else {
         if (uri.getValue().contains("|")) {
           x.ah(uri.getValue().substring(0, uri.getValue().indexOf("|"))).addText(uri.getValue());
-        } else {
+        } else if (url.startsWith("http:") || url.startsWith("https:") || url.startsWith("ftp:")) {
           x.ah(uri.getValue()).addText(uri.getValue());        
+        } else {
+          x.code().addText(uri.getValue());        
         }
       }
     }
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
index 58c497159..ce5e66516 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/Utilities.java
@@ -1090,7 +1090,8 @@ public class Utilities {
 
 
   public static boolean isAbsoluteUrl(String ref) {
-    return ref != null && (ref.startsWith("http:") || ref.startsWith("https:") || ref.startsWith("urn:uuid:") || ref.startsWith("urn:oid:"));
+    return ref != null && (ref.startsWith("http:") || ref.startsWith("https:") || ref.startsWith("urn:uuid:") || ref.startsWith("urn:oid:") || 
+        Utilities.startsWithInList(ref, "urn:iso:", "urn:iso-iec:", "urn:iso-cie:", "urn:iso-astm:", "urn:iso-ieee:", "urn:iec:")); // rfc5141
   }
 
 
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java
index 09902f2a2..df6d04c43 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java
@@ -48,7 +48,7 @@ public class I18nConstants {
   public static final String CODESYSTEM_CS_NO_VS_NOTCOMPLETE = "CODESYSTEM_CS_NO_VS_NOTCOMPLETE";
   public static final String CODESYSTEM_CS_VS_INCLUDEDETAILS = "CodeSystem_CS_VS_IncludeDetails";
   public static final String CODESYSTEM_CS_VS_INVALID = "CodeSystem_CS_VS_Invalid";
-  public static final String CODESYSTEM_CS_VS_MISMATCH = "CodeSystem_CS_VS_MisMatch";
+  public static final String CODESYSTEM_CS_VS_EXP_MISMATCH = "CODESYSTEM_CS_VS_EXP_MISMATCH";
   public static final String CODESYSTEM_CS_VS_WRONGSYSTEM = "CodeSystem_CS_VS_WrongSystem";
   public static final String CODE_FOUND_IN_EXPANSION_HOWEVER_ = "Code_found_in_expansion_however_";
   public static final String CODING_HAS_NO_SYSTEM__CANNOT_VALIDATE = "Coding_has_no_system__cannot_validate";
diff --git a/org.hl7.fhir.utilities/src/main/resources/Messages.properties b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
index f7e681281..b4759aa2e 100644
--- a/org.hl7.fhir.utilities/src/main/resources/Messages.properties
+++ b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
@@ -24,7 +24,7 @@ Bundle_Document_Date_Missing_html = [(type = ''document'') implies (meta.lastUpd
 CapabalityStatement_CS_SP_WrongType = Type mismatch - SearchParameter ''{0}'' type is {1}, but type here is {2}
 CodeSystem_CS_VS_IncludeDetails = CodeSystem {0} has an ''all system'' value set of {1}, but the include has extra details
 CodeSystem_CS_VS_Invalid = CodeSystem {0} has an ''all system'' value set of {1}, but doesn''t have a single include
-CodeSystem_CS_VS_MisMatch = CodeSystem {0} has an ''all system'' value set of {1}, but it is an expansion
+CODESYSTEM_CS_VS_EXP_MISMATCH = CodeSystem {0} has an ''all system'' value set of {1}, but it is an expansion with the wrong number of concepts (found {2}, expected {3})
 CodeSystem_CS_VS_WrongSystem = CodeSystem {0} has an ''all system'' value set of {1}, but doesn''t have a matching system ({2})
 Extension_EXT_Context_Wrong = The extension {0} is not allowed to be used at this point (allowed = {1}; this element is [{2})
 Extension_EXT_Count_Mismatch = Extensions count mismatch: expected {0} but found {1}
@@ -617,7 +617,7 @@ SD_NESTED_MUST_SUPPORT_SNAPSHOT = The element {0} has types/profiles/targets tha
 Unable_to_connect_to_terminology_server = Unable to connect to terminology server. Error = {0}
 SD_ED_TYPE_PROFILE_UNKNOWN = Unable to resolve profile {0}
 SD_ED_TYPE_PROFILE_NOTYPE = Found profile {0}, but unable to determine the type it applies it 
-SD_ED_TYPE_PROFILE_WRONG = Profile {0} is for type {1}, but the {3} element has type {2}
+SD_ED_TYPE_PROFILE_WRONG = Extension {0} is for type {1}, but the {3} element has type {2}
 SD_ED_TYPE_PROFILE_WRONG_TARGET = Profile {0} is for type {1}, which is not a {4} (which is required because the {3} element has type {2})
 SD_ED_TYPE_NO_TARGET_PROFILE = Type {0} does not allow for target Profiles 
 TERMINOLOGY_TX_NOSVC_BOUND_REQ = Could not confirm that the codes provided are from the required value set {0} because there is no terminology service
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/CodeSystemValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/CodeSystemValidator.java
index 2a1a750fc..869322d58 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/CodeSystemValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/CodeSystemValidator.java
@@ -38,15 +38,30 @@ public class CodeSystemValidator  extends BaseValidator {
         vs = null;
       }
       if (vs != null) {
-        if (rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs.hasCompose() && !vs.hasExpansion(), I18nConstants.CODESYSTEM_CS_VS_MISMATCH, url, vsu))
-          if (rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs.getCompose().getInclude().size() == 1, I18nConstants.CODESYSTEM_CS_VS_INVALID, url, vsu))
+        if (rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs.hasCompose(), I18nConstants.CODESYSTEM_CS_VS_INVALID, url, vsu)) { 
+          if (rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs.getCompose().getInclude().size() == 1, I18nConstants.CODESYSTEM_CS_VS_INVALID, url, vsu)) {
             if (rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs.getCompose().getInclude().get(0).getSystem().equals(url), I18nConstants.CODESYSTEM_CS_VS_WRONGSYSTEM, url, vsu, vs.getCompose().getInclude().get(0).getSystem())) {
               rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), !vs.getCompose().getInclude().get(0).hasValueSet()
                 && !vs.getCompose().getInclude().get(0).hasConcept() && !vs.getCompose().getInclude().get(0).hasFilter(), I18nConstants.CODESYSTEM_CS_VS_INCLUDEDETAILS, url, vsu);
+              if (vs.hasExpansion()) {
+                int count = countConcepts(cs); 
+                rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs.getExpansion().getContains().size() == count, I18nConstants.CODESYSTEM_CS_VS_EXP_MISMATCH, url, vsu, count, vs.getExpansion().getContains().size());
+              }
             }
+          }
+        }
       }
     } // todo... try getting the value set the other way...
   }
 
+  private int countConcepts(Element cs) {
+    List<Element> concepts = cs.getChildrenByName("concept");
+    int res = concepts.size();
+    for (Element concept : concepts) {
+      res = res + countConcepts(concept);
+    }
+    return res;
+  }
+
 
 }
\ No newline at end of file
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/StructureDefinitionValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/StructureDefinitionValidator.java
index 659d9a3e6..b40f6b82c 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/StructureDefinitionValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/type/StructureDefinitionValidator.java
@@ -174,7 +174,7 @@ public class StructureDefinitionValidator extends BaseValidator {
     rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), !snapshot || bindableType(typeCodes) != null, I18nConstants.SD_ED_BIND_NO_BINDABLE, path, typeCodes.toString());
     if (binding.hasChild("valueSet")) {
       Element valueSet = binding.getNamedChild("valueSet");
-      String ref = valueSet.hasPrimitiveValue() ? valueSet.primitiveValue() : valueSet.getNamedChildValue("refernece");
+      String ref = valueSet.hasPrimitiveValue() ? valueSet.primitiveValue() : valueSet.getNamedChildValue("reference");
       if (warning(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), !snapshot || ref != null, I18nConstants.SD_ED_SHOULD_BIND_WITH_VS, path)) {
         Resource vs = context.fetchResource(Resource.class, ref);
         if (warning(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), vs != null, I18nConstants.SD_ED_BIND_UNKNOWN_VS, path, ref)) {
@@ -300,10 +300,11 @@ public class StructureDefinitionValidator extends BaseValidator {
         return true;
       }
       sd = sd.hasBaseDefinition() ? context.fetchResource(StructureDefinition.class, sd.getBaseDefinition()) : null;
-      if (sd != null && !sd.getAbstract()) {
+      if (!(VersionUtilities.isR2Ver(context.getVersion()) || VersionUtilities.isR2BVer(context.getVersion())) && sd != null && !sd.getAbstract()) {
         sd = null;
       }
     }
+    
     return false;
   }