diff --git a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/DataTypeVisitor.java b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/DataTypeVisitor.java
new file mode 100644
index 000000000..dbd9c4f01
--- /dev/null
+++ b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/utils/DataTypeVisitor.java
@@ -0,0 +1,69 @@
+package org.hl7.fhir.r4b.utils;
+
+import org.hl7.fhir.r4b.model.Base;
+import org.hl7.fhir.r4b.model.DataType;
+import org.hl7.fhir.r4b.model.Property;
+import org.hl7.fhir.r4b.model.Resource;
+import org.hl7.fhir.utilities.Utilities;
+
+public class DataTypeVisitor {
+
+  public interface IDatatypeVisitor<T extends DataType> {
+    Class<T> classT();
+    boolean visit(String path, T node);
+  }
+
+  private boolean anyFalse;
+  private boolean anyTrue;
+  private int nodeCount;
+  private int selectedCount;
+  
+  public <T extends DataType> void visit(Resource resource, IDatatypeVisitor<T> visitor) {
+    visitNode(resource.fhirType(), resource, visitor);
+  }
+
+  @SuppressWarnings("unchecked")
+  private <T extends DataType> void visitNode(String path, Base node, IDatatypeVisitor<T> visitor) {
+    nodeCount++;
+    if (node instanceof DataType && visitor.classT().isInstance(node)) {
+      selectedCount++;
+      boolean ok = visitor.visit(path, (T) node);
+      if (ok) {
+        anyTrue = true;
+      } else {
+        anyFalse = true;
+      }
+    }
+    for (Property p : node.children()) {
+      if (p.isList()) {
+        int i = 0;
+        for (Base b : p.getValues()) {
+          visitNode(path+"."+p.getName()+"["+i+"]", b, visitor);
+          i++;
+        }
+      } else {
+        for (Base b : p.getValues()) {
+          visitNode(path+"."+p.getName(), b, visitor);
+        }
+      }
+    }
+  }
+
+  public boolean isAnyFalse() {
+    return anyFalse;
+  }
+
+  public boolean isAnyTrue() {
+    return anyTrue;
+  }
+
+  public int getNodeCount() {
+    return nodeCount;
+  }
+
+  public int getSelectedCount() {
+    return selectedCount;
+  }
+  
+  
+}
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Extension.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Extension.java
index 9508dd5db..62807a278 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Extension.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Extension.java
@@ -68,6 +68,11 @@ public class Extension extends BaseExtension implements IBaseExtension<Extension
     @Description(shortDefinition="Value of extension", formalDefinition="Value of extension - must be one of a constrained set of the data types (see [Extensibility](extensibility.html) for a list)." )
     protected DataType value;
 
+    @Override
+    public String toString() {
+      return url + "=" + value.toString();
+    }
+
     private static final long serialVersionUID = 465890108L;
 
   /**
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/ImplementationGuide.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/ImplementationGuide.java
index e9bb104dd..3abb66c86 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/ImplementationGuide.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/ImplementationGuide.java
@@ -7159,6 +7159,12 @@ public class ImplementationGuide extends CanonicalResource {
         @Description(shortDefinition="Location of the resource", formalDefinition="Where this resource is found." )
         protected Reference reference;
 
+        @Override
+        public String toString() {
+          return "ImplementationGuideDefinitionResourceComponent [name=" + name + ", reference=" + reference
+              + ", profile=" + profile + "]";
+        }
+
         /**
          * Indicates the FHIR Version(s) this artifact is intended to apply to. If no versions are specified, the resource is assumed to apply to all the versions stated in ImplementationGuide.fhirVersion.
          */
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 3a8a46dce..4a3e49844 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
@@ -146,8 +146,13 @@ public class DataRenderer extends Renderer implements CodeResolver {
         String left = text.substring(0, text.indexOf("[[["));
         String link = text.substring(text.indexOf("[[[")+3, text.indexOf("]]]"));
         String right = text.substring(text.indexOf("]]]")+3);
+        String path = null;
         String url = link;
         String[] parts = link.split("\\#");
+        if (parts[0].contains(".")) {
+          path = parts[0];
+          parts[0] = parts[0].substring(0, parts[0].indexOf("."));
+        }
         StructureDefinition p = getContext().getWorker().fetchResource(StructureDefinition.class, parts[0]);
         if (p == null)
           p = getContext().getWorker().fetchTypeDefinition(parts[0]);
@@ -160,7 +165,7 @@ public class DataRenderer extends Renderer implements CodeResolver {
         } else
           throw new DefinitionException("Unable to resolve markdown link "+link);
   
-        text = left+"["+link+"]("+url+")"+right;
+        text = left+"["+link+"]("+url+(path == null ? "" : "#"+path)+")"+right;
       }
   
       // 2. markdown
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/DataTypeVisitor.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/DataTypeVisitor.java
new file mode 100644
index 000000000..28e68d18c
--- /dev/null
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/DataTypeVisitor.java
@@ -0,0 +1,68 @@
+package org.hl7.fhir.r5.utils;
+
+import org.hl7.fhir.r5.model.Base;
+import org.hl7.fhir.r5.model.DataType;
+import org.hl7.fhir.r5.model.Property;
+import org.hl7.fhir.r5.model.Resource;
+
+public class DataTypeVisitor {
+
+  public interface IDatatypeVisitor<T extends DataType> {
+    Class<T> classT();
+    boolean visit(String path, T node);
+  }
+
+  private boolean anyFalse;
+  private boolean anyTrue;
+  private int nodeCount;
+  private int selectedCount;
+  
+  public <T extends DataType> void visit(Resource resource, IDatatypeVisitor<T> visitor) {
+    visitNode(resource.fhirType(), resource, visitor);
+  }
+
+  @SuppressWarnings("unchecked")
+  private <T extends DataType> void visitNode(String path, Base node, IDatatypeVisitor<T> visitor) {
+    nodeCount++;
+    if (node instanceof DataType && visitor.classT().isInstance(node)) {
+      selectedCount++;
+      boolean ok = visitor.visit(path, (T) node);
+      if (ok) {
+        anyTrue = true;
+      } else {
+        anyFalse = true;
+      }
+    }
+    for (Property p : node.children()) {
+      if (p.isList()) {
+        int i = 0;
+        for (Base b : p.getValues()) {
+          visitNode(path+"."+p.getName()+"["+i+"]", b, visitor);
+          i++;
+        }
+      } else {
+        for (Base b : p.getValues()) {
+          visitNode(path+"."+p.getName(), b, visitor);
+        }
+      }
+    }
+  }
+
+  public boolean isAnyFalse() {
+    return anyFalse;
+  }
+
+  public boolean isAnyTrue() {
+    return anyTrue;
+  }
+
+  public int getNodeCount() {
+    return nodeCount;
+  }
+
+  public int getSelectedCount() {
+    return selectedCount;
+  }
+  
+  
+}