diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/GraphQLSchemaGenerator.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/GraphQLSchemaGenerator.java
index 5b0d1d717..a637231dd 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/GraphQLSchemaGenerator.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/GraphQLSchemaGenerator.java
@@ -491,9 +491,8 @@ public class GraphQLSchemaGenerator {
 
   private String getJsonFormat(StructureDefinition sd) throws FHIRException {
     for (ElementDefinition ed : sd.getSnapshot().getElement()) {
-      throw new Error("What is this code doing?");
-//      if (!ed.getType().isEmpty() && ed.getType().get(0).getCodeElement().hasExtension(" http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type"))
-//        return ed.getType().get(0).getCodeElement().getExtensionString(" http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type");
+      if (!ed.getType().isEmpty() && ed.getType().get(0).getCodeElement().hasExtension("http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type"))
+        return ed.getType().get(0).getCodeElement().getExtensionString(" http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type");
     }
     // all primitives but JSON_NUMBER_TYPES are represented as JSON strings
     if (JSON_NUMBER_TYPES.contains(sd.getName())) {
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 6d21e8277..2a40bd170 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
@@ -125,6 +125,22 @@ public class ToolingExtensions {
   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"; 
+  public static final String EXT_IGP_SPREADSHEET = "http://hl7.org/fhir/StructureDefinition/igpublisher-spreadsheet";
+  public static final String EXT_IGP_MAPPING_CSV = "http://hl7.org/fhir/StructureDefinition/igpublisher-mapping-csv";
+  public static final String EXT_IGP_BUNDLE = "http://hl7.org/fhir/StructureDefinition/igpublisher-bundle";
+  public static final String EXT_IGP_BASE = "http://hl7.org/fhir/StructureDefinition/igpublisher-res-base";
+  public static final String EXT_IGP_DEFNS = "http://hl7.org/fhir/StructureDefinition/igpublisher-res-defns";
+  public static final String EXT_IGP_FORMAT = "http://hl7.org/fhir/StructureDefinition/igpublisher-res-format";
+  public static final String EXT_IGP_SOURCE = "http://hl7.org/fhir/StructureDefinition/igpublisher-res-source";
+  public static final String EXT_IGP_CONTAINED_RESOURCE_INFO = "http://hl7.org/fhir/tools/StructureDefinition/contained-resource-information";
+  public static final String EXT_PRIVATE_BASE = "http://hl7.org/fhir/tools/";
+  public static final String EXT_BINARY_FORMAT = "http://hl7.org/fhir/StructureDefinition/implementationguide-resource-format";
+  public static final String EXT_IGP_RESOURCE_INFO = "http://hl7.org/fhir/tools/StructureDefinition/resource-information";
+  public static final String EXT_IGP_LOADVERSION = "http://hl7.org/fhir/StructureDefinition/igpublisher-loadversion";
+  public static final String EXT_LIST_PACKAGE = "http://hl7.org/fhir/StructureDefinition/list-packageId";
+
   // validated
   //  private static final String EXT_OID = "http://hl7.org/fhir/StructureDefinition/valueset-oid";
   //  public static final String EXT_DEPRECATED = "http://hl7.org/fhir/StructureDefinition/codesystem-deprecated";
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java
index b37965b2c..47e5e27a8 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/json/JsonTrackingParser.java
@@ -1,5 +1,7 @@
 package org.hl7.fhir.utilities.json;
 
+import static org.junit.jupiter.api.DynamicContainer.dynamicContainer;
+
 import java.io.File;
 
 /*
@@ -375,6 +377,10 @@ public class JsonTrackingParser {
     return parse(TextFile.bytesToString(stream), null);
   }
   
+  public static JsonArray parseJsonArray(byte[] stream) throws IOException {
+    return parseArray(TextFile.bytesToString(stream), null);
+  }
+  
   public static JsonObject parseJson(byte[] stream, boolean allowDuplicates) throws IOException {
     return parse(TextFile.bytesToString(stream), null, allowDuplicates);
   }
@@ -391,17 +397,34 @@ public class JsonTrackingParser {
     return parse(source, map, false);
   }
     
+  public static JsonArray parseArray(String source, Map<JsonElement, LocationData> map) throws IOException {
+    return parseArray(source, map, false);
+  }
+    
+    
   public static JsonObject parse(String source, Map<JsonElement, LocationData> map, boolean allowDuplicates) throws IOException {
     return parse(source, map, allowDuplicates, false);
   }
   
+  public static JsonArray parseArray(String source, Map<JsonElement, LocationData> map, boolean allowDuplicates) throws IOException {
+    return parseArray(source, map, allowDuplicates, false);
+  }
+  
   public static JsonObject parse(String source, Map<JsonElement, LocationData> map, boolean allowDuplicates, boolean allowComments) throws IOException {
-		JsonTrackingParser self = new JsonTrackingParser();
-		self.map = map;
-		self.setErrorOnDuplicates(!allowDuplicates);
-		self.setAllowComments(allowComments);
+    JsonTrackingParser self = new JsonTrackingParser();
+    self.map = map;
+    self.setErrorOnDuplicates(!allowDuplicates);
+    self.setAllowComments(allowComments);
     return self.parse(Utilities.stripBOM(source));
-	}
+  }
+
+  public static JsonArray parseArray(String source, Map<JsonElement, LocationData> map, boolean allowDuplicates, boolean allowComments) throws IOException {
+    JsonTrackingParser self = new JsonTrackingParser();
+    self.map = map;
+    self.setErrorOnDuplicates(!allowDuplicates);
+    self.setAllowComments(allowComments);
+    return self.parseArray(Utilities.stripBOM(source));
+  }
 
 	private JsonObject parse(String source) throws IOException {
 		lexer = new Lexer(source);
@@ -421,6 +444,10 @@ public class JsonTrackingParser {
     return result;
 	}
 
+  private JsonArray parseArray(String source) throws IOException {
+    return new Gson().fromJson(source, JsonArray.class);
+  }
+
 	private void readObject(JsonObject obj, boolean root) throws IOException {
 	  if (map != null)
       map.put(obj, lexer.location.copy());
@@ -703,5 +730,11 @@ public class JsonTrackingParser {
     return parseJson(res.getContent());
   }
   
+  public static JsonArray fetchJsonArray(String source) throws IOException {
+    SimpleHTTPClient fetcher = new SimpleHTTPClient();
+    HTTPResult res = fetcher.get(source+"?nocache=" + System.currentTimeMillis());
+    res.checkThrowException();
+    return parseJsonArray(res.getContent());
+  }
 	
 }
\ No newline at end of file