diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/KeyGenerator.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/KeyGenerator.java
new file mode 100644
index 000000000..d0dc272a1
--- /dev/null
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/KeyGenerator.java
@@ -0,0 +1,75 @@
+package org.hl7.fhir.r5.utils;
+
+import org.hl7.fhir.r5.model.DomainResource;
+import org.hl7.fhir.r5.model.MetadataResource;
+import org.hl7.fhir.utilities.Utilities;
+
+public class KeyGenerator {
+
+  private String canonical; 
+  int i = 0;
+  
+  public KeyGenerator(String canonical) {
+    super();
+    this.canonical = canonical;
+  }
+
+  public void genId(DomainResource dr) {
+    i++;
+    dr.setId(getAcronym(dr.fhirType())+Integer.toString(i));
+    if (dr instanceof MetadataResource) {
+      MetadataResource mr = (MetadataResource) dr;
+      mr.setUrl(Utilities.pathURL(canonical, mr.fhirType(), mr.getId()));
+    }
+  }
+
+  private String getAcronym(String rt) {
+    if ("CapabilityStatement".equals(rt)) {
+      return "cs";
+    }
+    if ("ValueSet".equals(rt)) {
+      return "vs";
+    }
+    if ("CodeSystem".equals(rt)) {
+      return "cs";
+    }
+    if ("StructureDefinition".equals(rt)) {
+      return "sd";
+    }
+    if ("StructureMap".equals(rt)) {
+      return "sm";
+    }
+    if ("ConceptMap".equals(rt)) {
+      return "cm";
+    }
+    if ("ImplementationGuide".equals(rt)) {
+      return "";
+    }
+    if ("SearchParameter".equals(rt)) {
+      return "sp";
+    }
+    if ("MessageDefinition".equals(rt)) {
+      return "md";
+    }
+    if ("OperationDefinition".equals(rt)) {
+      return "od";
+    }
+    if ("CompartmentDefinition".equals(rt)) {
+      return "cd";
+    }
+    if ("GraphDefinition".equals(rt)) {
+      return "gd";
+    }
+    if ("ExampleScenario".equals(rt)) {
+      return "es";
+    }
+    if ("NamingSystem".equals(rt)) {
+      return "ns";
+    }
+    if ("TerminologyCapabilities".equals(rt)) {
+      return "tc";
+    }
+    return "r";
+  }
+
+}