diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
index fcbed22af..c386925e3 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/ToolingExtensions.java
@@ -121,7 +121,6 @@ public class ToolingExtensions {
   public static final String EXT_XML_NAME = "http://hl7.org/fhir/StructureDefinition/elementdefinition-xml-name";  
   public static final String EXT_BINDING_STYLE = "http://hl7.org/fhir/StructureDefinition/elementdefinition-binding-style";
   public static final String EXT_EXPLICIT_TYPE = "http://hl7.org/fhir/StructureDefinition/structuredefinition-explicit-type-name";
-  public static final String EXT_TIME_FORMAT = "http://hl7.org/fhir/StructureDefinition/elementdefinition-timeformat";
 
   public static final String EXT_IGP_RESOURCES = "http://hl7.org/fhir/StructureDefinition/igpublisher-folder-resource";
   public static final String EXT_IGP_PAGES = "http://hl7.org/fhir/StructureDefinition/igpublisher-folder-pages"; 
@@ -210,6 +209,7 @@ public class ToolingExtensions {
   public static final String EXT_XML_NO_ORDER = "http://hl7.org/fhir/StructureDefinition/structuredefinition-xml-no-order";
   public static final String EXT_DEF_TYPE = "http://hl7.org/fhir/StructureDefinition/elementdefinition-defaulttype";
   public static final String EXT_TYPE_SPEC = "http://hl7.org/fhir/tools/StructureDefinition/type-specifier";
+  public static final String EXT_TYPE_CHARACTERISTICS = "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics";
   
   // in the tooling IG
   public static final String EXT_PRIVATE_BASE = "http://hl7.org/fhir/tools/";
@@ -217,6 +217,7 @@ public class ToolingExtensions {
   public static final String EXT_JSON_PROP_KEY = "http://hl7.org/fhir/tools/StructureDefinition/json-property-key";
   public static final String EXT_JSON_EMPTY = "http://hl7.org/fhir/tools/StructureDefinition/json-empty-behavior";
   public static final String EXT_IMPLIED_PREFIX = "http://hl7.org/fhir/tools/StructureDefinition/implied-string-prefix";
+  public static final String EXT_DATE_FORMAT = "http://hl7.org/fhir/tools/StructureDefinition/elementdefinition-date-format";
     
 
   // unregistered? - don't know what these are used for 
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 e9222c8f6..705e2bf5a 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
@@ -357,7 +357,8 @@ public class I18nConstants {
   public static final String REFERENCE_TO__CANNOT_BE_RESOLVED = "reference_to__cannot_be_resolved";
   public static final String REFERENCE__REFERS_TO_A__NOT_A_VALUESET = "Reference__refers_to_a__not_a_ValueSet";
   public static final String RESOURCE_RESOLUTION_SERVICES_NOT_PROVIDED = "Resource_resolution_services_not_provided";
-  public static final String RESOURCE_RES_ID_MALFORMED = "Resource_RES_ID_Malformed";
+  public static final String RESOURCE_RES_ID_MALFORMED_CHARS = "Resource_RES_ID_Malformed_Chars";
+  public static final String RESOURCE_RES_ID_MALFORMED_LENGTH = "Resource_RES_ID_Malformed_Length";
   public static final String RESOURCE_RES_ID_MISSING = "Resource_RES_ID_Missing";
   public static final String RESOURCE_RES_ID_PROHIBITED = "Resource_RES_ID_Prohibited";
   public static final String RESOURCE_TYPE_MISMATCH_FOR___ = "Resource_type_mismatch_for___";
diff --git a/org.hl7.fhir.utilities/src/main/resources/Messages.properties b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
index 114af80fb..2609b86ab 100644
--- a/org.hl7.fhir.utilities/src/main/resources/Messages.properties
+++ b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
@@ -123,7 +123,8 @@ Reference_REF_NotFound_Bundle = Bundled or contained reference not found within
 Reference_REF_ResourceType = Matching reference for reference {0} has resourceType {1}
 Reference_REF_WrongTarget = The type ''{0}'' is not a valid Target for this element (must be one of {1})
 REFERENCE_REF_WRONGTARGET_LOAD = The type ''{2}'' is not a valid Target for the element {0} (must be {1})
-Resource_RES_ID_Malformed = Invalid Resource id
+Resource_RES_ID_Malformed_Length = Invalid Resource id: Too long
+Resource_RES_ID_Malformed_Chars = Invalid Resource id: Invalid Characters
 Resource_RES_ID_Missing = Resource requires an id, but none is present
 Resource_RES_ID_Prohibited = Resource has an id, but none is allowed
 Terminology_PassThrough_TX_Message = {0} for ''{1}#{2}''
@@ -728,7 +729,7 @@ TX_SERVER_NO_BATCH_RESPONSE = The server return null from a batch validation req
 BUNDLE_POSSSIBLE_MATCHES = The bundle contains no match for {1} by the rules of Bundle reference resolution, but it has multiple resources that match {0} by resource type and id
 BUNDLE_BUNDLE_POSSIBLE_MATCH_NO_FU = Entry {0} matches the reference {1} by type and id but it does not match the full target URL {2} by Bundle resolution rules
 BUNDLE_BUNDLE_POSSIBLE_MATCH_WRONG_FU = Entry {0} matches the reference {1} by type and id but it''s fullUrl {2} does not match the full target URL {3} by Bundle resolution rules
-SD_ILLEGAL_CHARACTERISTICS = This element has a {0} but the types {1} to do not make this kind of constraint relevant
+SD_ILLEGAL_CHARACTERISTICS = This element has a {0} but the types {1} do not make this kind of constraint relevant
 SD_VALUE_COMPLEX_FIXED = For the complex type {0}, consider using a pattern rather than a fixed value to avoid over-constraining the instance
 VALUESET_SHAREABLE_MISSING = The ShareableValueSet profile says that the {0} element is mandatory, but it is not present. Published value sets SHOULD conform to the ShareableValueSet profile
 VALUESET_SHAREABLE_EXTRA_MISSING = The ShareableValueSet profile recommends that the {0} element is populated, but it is not present. Published value sets SHOULD conform to the ShareableValueSet profile
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
index ba7355590..c5071610b 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
@@ -5866,7 +5866,11 @@ public class InstanceValidator extends BaseValidator implements IResourceValidat
         Element eid = element.getNamedChild(ID);
         if (eid.getProperty() != null && eid.getProperty().getDefinition() != null && eid.getProperty().getDefinition().getBase().getPath().equals("Resource.id")) {
           NodeStack ns = stack.push(eid, -1, eid.getProperty().getDefinition(), null);
-          rule(errors, IssueType.INVALID, eid.line(), eid.col(), ns.getLiteralPath(), FormatUtilities.isValidId(eid.primitiveValue()), I18nConstants.RESOURCE_RES_ID_MALFORMED);
+          if (eid.primitiveValue() != null && eid.primitiveValue().length() > 64) {
+            rule(errors, IssueType.INVALID, eid.line(), eid.col(), ns.getLiteralPath(), false, I18nConstants.RESOURCE_RES_ID_MALFORMED_LENGTH);
+          } else {
+            rule(errors, IssueType.INVALID, eid.line(), eid.col(), ns.getLiteralPath(), FormatUtilities.isValidId(eid.primitiveValue()), I18nConstants.RESOURCE_RES_ID_MALFORMED_CHARS);
+          }
         }
       }
       // validate
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 73cf6ed13..042e8a2f9 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
@@ -23,6 +23,7 @@ import org.hl7.fhir.r5.formats.IParser.OutputStyle;
 import org.hl7.fhir.r5.model.Coding;
 import org.hl7.fhir.r5.model.ElementDefinition;
 import org.hl7.fhir.r5.model.ExpressionNode;
+import org.hl7.fhir.r5.model.Extension;
 import org.hl7.fhir.r5.model.Resource;
 import org.hl7.fhir.r5.model.StructureDefinition;
 import org.hl7.fhir.r5.model.StructureDefinition.StructureDefinitionKind;
@@ -149,7 +150,15 @@ public class StructureDefinitionValidator extends BaseValidator {
       }
       typeCodes.add(tc);
       Set<String> tcharacteristics = new HashSet<>();
-      addCharacteristics(tcharacteristics, tc);
+      StructureDefinition tsd = context.fetchTypeDefinition(tc);
+      if (tsd != null && tsd.hasExtension(ToolingExtensions.EXT_TYPE_CHARACTERISTICS)) {
+        for (Extension ext : tsd.getExtensionsByUrl(ToolingExtensions.EXT_TYPE_CHARACTERISTICS)) {
+          tcharacteristics.add(ext.getValue().primitiveValue());
+        }
+      } else {
+        // nothing specified, so infer from known types
+        addCharacteristics(tcharacteristics, tc);
+      }
       characteristics.addAll(tcharacteristics);
       if (type.hasChildren("targetProfile")) {
         rule(errors, IssueType.BUSINESSRULE, stack.getLiteralPath(), tcharacteristics.contains("has-target") , I18nConstants.SD_ILLEGAL_CHARACTERISTICS, "targetProfile", tc);
@@ -345,6 +354,11 @@ public class StructureDefinitionValidator extends BaseValidator {
         if (sd.hasExtension(ToolingExtensions.EXT_BINDING_STYLE)) {
           return tc;          
         }
+        for (Extension ext : sd.getExtensionsByUrl(ToolingExtensions.EXT_TYPE_CHARACTERISTICS)) {
+          if ("can-bind".equals(ext.getValue().primitiveValue())) {
+            return tc;
+          }
+        }
       }
     }
     return null;
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/profile/ProfileValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/profile/ProfileValidator.java
index c09a5cdbc..5ea1bbf23 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/profile/ProfileValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/profile/ProfileValidator.java
@@ -39,6 +39,7 @@ import org.hl7.fhir.r5.model.ElementDefinition;
 import org.hl7.fhir.r5.model.ElementDefinition.ElementDefinitionConstraintComponent;
 import org.hl7.fhir.r5.model.ElementDefinition.TypeRefComponent;
 import org.hl7.fhir.r5.model.StructureDefinition;
+import org.hl7.fhir.r5.model.StructureDefinition.StructureDefinitionKind;
 import org.hl7.fhir.r5.utils.FHIRPathEngine;
 import org.hl7.fhir.r5.utils.XVerExtensionManager;
 import org.hl7.fhir.utilities.Utilities;
@@ -83,8 +84,9 @@ public class ProfileValidator extends BaseValidator {
     List<ValidationMessage> errors = new ArrayList<ValidationMessage>();
     
     // must have a FHIR version- GF#3160
-    warning(errors, IssueType.BUSINESSRULE, profile.getUrl(), profile.hasFhirVersion(), "Profiles SHOULD state the FHIR Version on which they are based");
-    warning(errors, IssueType.BUSINESSRULE, profile.getUrl(), profile.hasVersion(), "Profiles SHOULD state their own version");
+    String s = (profile.getKind() == StructureDefinitionKind.LOGICAL) ? "Logical Models" : "Profiles";
+    warning(errors, IssueType.BUSINESSRULE, profile.getUrl(), profile.hasFhirVersion(), s+" SHOULD state the FHIR Version on which they are based");
+    warning(errors, IssueType.BUSINESSRULE, profile.getUrl(), profile.hasVersion(), s+" SHOULD state their own version");
     
     // extensions must be defined
     for (ElementDefinition ec : profile.getDifferential().getElement())