From 3e5a63e0f2b35da1f98269176d629cc1dfbb6475 Mon Sep 17 00:00:00 2001
From: dotasek <david.otasek@smilecdr.com>
Date: Mon, 1 May 2023 15:58:38 -0400
Subject: [PATCH] Move ignore extension logic in 40_50 convertors

---
 .../advisors/impl/BaseAdvisor_40_50.java      |   7 +-
 .../conv40_50/VersionConvertor_40_50.java     |   8 +-
 .../resources40_50/ActorDefinition40_50.java  | 158 +++++++++++-------
 .../resources40_50/Requirements40_50.java     | 140 ++++++++++------
 .../resources40_50/Resource40_50.java         |  10 +-
 5 files changed, 203 insertions(+), 120 deletions(-)

diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/advisors/impl/BaseAdvisor_40_50.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/advisors/impl/BaseAdvisor_40_50.java
index efd01620b..5c2581f30 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/advisors/impl/BaseAdvisor_40_50.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/advisors/impl/BaseAdvisor_40_50.java
@@ -34,11 +34,8 @@ public class BaseAdvisor_40_50 extends BaseAdvisor50<org.hl7.fhir.r4.model.Exten
     final String lastPath = paths.get(paths.size() - 1);
     if ((lastPath.equals("TestScript")) && (TestScriptIgnoredUrls.contains(url))) {
       return true;
-    } else if (lastPath.equals("Basic") && url.startsWith("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.")) {
-      return true;
-    } else if (lastPath.equals("Basic") && url.startsWith("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.")) {
-      return true;
-    } else
+    }
+    else
       return false;
   }
 
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/VersionConvertor_40_50.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/VersionConvertor_40_50.java
index c7db605b8..3ba719a18 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/VersionConvertor_40_50.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/VersionConvertor_40_50.java
@@ -108,13 +108,13 @@ public class VersionConvertor_40_50 {
   }
 
   public void copyDomainResource(@Nonnull org.hl7.fhir.r4.model.DomainResource src,
-                                 @Nonnull org.hl7.fhir.r5.model.DomainResource tgt) throws FHIRException {
-    resourceConvertor.copyDomainResource(src, tgt);
+                                 @Nonnull org.hl7.fhir.r5.model.DomainResource tgt, String... ignoredExtensionUrls) throws FHIRException {
+    resourceConvertor.copyDomainResource(src, tgt, ignoredExtensionUrls);
   }
 
   public void copyDomainResource(@Nonnull org.hl7.fhir.r5.model.DomainResource src,
-                                 @Nonnull org.hl7.fhir.r4.model.DomainResource tgt) throws FHIRException {
-    resourceConvertor.copyDomainResource(src, tgt);
+                                 @Nonnull org.hl7.fhir.r4.model.DomainResource tgt, String... ignoredExtensionUrls) throws FHIRException {
+    resourceConvertor.copyDomainResource(src, tgt, ignoredExtensionUrls);
   }
 
   public void copyElement(@Nonnull org.hl7.fhir.r4.model.Element src,
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/ActorDefinition40_50.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/ActorDefinition40_50.java
index 5be16755f..7b79165e9 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/ActorDefinition40_50.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/ActorDefinition40_50.java
@@ -52,6 +52,50 @@ import org.hl7.fhir.r5.model.UsageContext;
 // Generated on Sun, Feb 24, 2019 11:37+1100 for FHIR v4.0.0
 public class ActorDefinition40_50 {
 
+  public static final String URL_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.url";
+  public static final String VERSION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.version";
+  public static final String NAME_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.name";
+  public static final String TITLE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.title";
+  public static final String STATUS_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.status";
+  public static final String EXPERIMENTAL_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.experimental";
+  public static final String DATE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.date";
+  public static final String PUBLISHER_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.publisher";
+  public static final String CONTACT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.contact";
+  public static final String DESCRIPTION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.description";
+  public static final String USE_CONTEXT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.useContext";
+  public static final String JURISDICTION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.jurisdiction";
+  public static final String PURPOSE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.purpose";
+  public static final String COPYRIGHT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyright";
+  public static final String COPYRIGHT_LABEL_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyrightLabel";
+  public static final String TYPE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.type";
+  public static final String DOCUMENTATION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.documentation";
+  public static final String REFERENCE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.reference";
+  public static final String CAPABILITIES_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.capabilities";
+  public static final String DERIVED_FROM_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.derivedFrom";
+
+  private static final String[] IGNORED_EXTENSION_URLS = new String[]{
+    URL_EXTENSION_URL,
+    VERSION_EXTENSION_URL,
+    NAME_EXTENSION_URL,
+    TITLE_EXTENSION_URL,
+    STATUS_EXTENSION_URL,
+    EXPERIMENTAL_EXTENSION_URL,
+    DATE_EXTENSION_URL,
+    PUBLISHER_EXTENSION_URL,
+    CONTACT_EXTENSION_URL,
+    DESCRIPTION_EXTENSION_URL,
+    USE_CONTEXT_EXTENSION_URL,
+    JURISDICTION_EXTENSION_URL,
+    PURPOSE_EXTENSION_URL,
+    COPYRIGHT_EXTENSION_URL,
+    COPYRIGHT_LABEL_EXTENSION_URL,
+    TYPE_EXTENSION_URL,
+    DOCUMENTATION_EXTENSION_URL,
+    REFERENCE_EXTENSION_URL,
+    CAPABILITIES_EXTENSION_URL,
+    DERIVED_FROM_EXTENSION_URL
+  };
+
   public static org.hl7.fhir.r5.model.ActorDefinition convertActorDefinition(org.hl7.fhir.r4.model.Basic src) throws FHIRException {
     if (src == null)
       return null;
@@ -59,70 +103,70 @@ public class ActorDefinition40_50 {
       throw new FHIRException("Error in logic: this basic resource is not an ActorDefinition");
     }
     org.hl7.fhir.r5.model.ActorDefinition tgt = new org.hl7.fhir.r5.model.ActorDefinition();
-    //FIXME add ignore
-    ConversionContext40_50.INSTANCE.getVersionConvertor_40_50().copyDomainResource(src, tgt);
+
+    ConversionContext40_50.INSTANCE.getVersionConvertor_40_50().copyDomainResource(src, tgt, IGNORED_EXTENSION_URLS);
     
     for (org.hl7.fhir.r4.model.Identifier t : src.getIdentifier())
       tgt.addIdentifier(Identifier40_50.convertIdentifier(t));
 
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.url")) {
-      tgt.setUrlElement(Uri40_50.convertUri((org.hl7.fhir.r4.model.UriType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.url").getValue()));
+    if (src.hasExtension(URL_EXTENSION_URL)) {
+      tgt.setUrlElement(Uri40_50.convertUri((org.hl7.fhir.r4.model.UriType) src.getExtensionByUrl(URL_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.version")) {
-      tgt.setVersionElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.version").getValue()));
+    if (src.hasExtension(VERSION_EXTENSION_URL)) {
+      tgt.setVersionElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(VERSION_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.name")) {
-      tgt.setNameElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.name").getValue()));
+    if (src.hasExtension(NAME_EXTENSION_URL)) {
+      tgt.setNameElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(NAME_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.title")) {
-      tgt.setTitleElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.title").getValue()));
+    if (src.hasExtension(TITLE_EXTENSION_URL)) {
+      tgt.setTitleElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(TITLE_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.status")) {
-      tgt.setStatus(PublicationStatus.fromCode(src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.status").getValue().primitiveValue()));
+    if (src.hasExtension(STATUS_EXTENSION_URL)) {
+      tgt.setStatus(PublicationStatus.fromCode(src.getExtensionByUrl(STATUS_EXTENSION_URL).getValue().primitiveValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.experimental")) {
-      tgt.setExperimentalElement(Boolean40_50.convertBoolean((org.hl7.fhir.r4.model.BooleanType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.experimental").getValue()));
+    if (src.hasExtension(EXPERIMENTAL_EXTENSION_URL)) {
+      tgt.setExperimentalElement(Boolean40_50.convertBoolean((org.hl7.fhir.r4.model.BooleanType) src.getExtensionByUrl(EXPERIMENTAL_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.date")) {
-      tgt.setDateElement(DateTime40_50.convertDateTime((org.hl7.fhir.r4.model.DateTimeType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.date").getValue()));
+    if (src.hasExtension(DATE_EXTENSION_URL)) {
+      tgt.setDateElement(DateTime40_50.convertDateTime((org.hl7.fhir.r4.model.DateTimeType) src.getExtensionByUrl(DATE_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.publisher")) {
-      tgt.setPublisherElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.publisher").getValue()));
+    if (src.hasExtension(PUBLISHER_EXTENSION_URL)) {
+      tgt.setPublisherElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(PUBLISHER_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.contact")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(CONTACT_EXTENSION_URL)) {
       tgt.addContact(ContactDetail40_50.convertContactDetail((org.hl7.fhir.r4.model.ContactDetail) ext.getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.description")) {
-      tgt.setPublisherElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.description").getValue()));
+    if (src.hasExtension(DESCRIPTION_EXTENSION_URL)) {
+      tgt.setPublisherElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(DESCRIPTION_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.useContext")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(USE_CONTEXT_EXTENSION_URL)) {
       tgt.addUseContext(UsageContext40_50.convertUsageContext((org.hl7.fhir.r4.model.UsageContext) ext.getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.jurisdiction")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(JURISDICTION_EXTENSION_URL)) {
       tgt.addJurisdiction(CodeableConcept40_50.convertCodeableConcept((org.hl7.fhir.r4.model.CodeableConcept) ext.getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.purpose")) {
-      tgt.setPurposeElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.purpose").getValue()));
+    if (src.hasExtension(PURPOSE_EXTENSION_URL)) {
+      tgt.setPurposeElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(PURPOSE_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyright")) {
-      tgt.setCopyrightElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyright").getValue()));
+    if (src.hasExtension(COPYRIGHT_EXTENSION_URL)) {
+      tgt.setCopyrightElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(COPYRIGHT_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyrightLabel")) {
-      tgt.setCopyrightLabelElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyrightLabel").getValue()));
+    if (src.hasExtension(COPYRIGHT_LABEL_EXTENSION_URL)) {
+      tgt.setCopyrightLabelElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(COPYRIGHT_LABEL_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.type")) {
-      tgt.setType(ExampleScenarioActorType.fromCode(src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.type").getValue().primitiveValue()));
+    if (src.hasExtension(TYPE_EXTENSION_URL)) {
+      tgt.setType(ExampleScenarioActorType.fromCode(src.getExtensionByUrl(TYPE_EXTENSION_URL).getValue().primitiveValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.documentation")) {
-      tgt.setDocumentationElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.documentation").getValue()));
+    if (src.hasExtension(DOCUMENTATION_EXTENSION_URL)) {
+      tgt.setDocumentationElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(DOCUMENTATION_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.reference")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(REFERENCE_EXTENSION_URL)) {
       tgt.getReference().add(Url40_50.convertUrl((org.hl7.fhir.r4.model.UrlType) ext.getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.capabilities")) {
-      tgt.setCapabilitiesElement(Canonical40_50.convertCanonical((org.hl7.fhir.r4.model.CanonicalType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.capabilities").getValue()));
+    if (src.hasExtension(CAPABILITIES_EXTENSION_URL)) {
+      tgt.setCapabilitiesElement(Canonical40_50.convertCanonical((org.hl7.fhir.r4.model.CanonicalType) src.getExtensionByUrl(CAPABILITIES_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.derivedFrom")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(DERIVED_FROM_EXTENSION_URL)) {
       tgt.getDerivedFrom().add(Canonical40_50.convertCanonical((org.hl7.fhir.r4.model.CanonicalType) ext.getValue()));
     }
     return tgt;
@@ -138,64 +182,64 @@ public class ActorDefinition40_50 {
     for (org.hl7.fhir.r5.model.Identifier t : src.getIdentifier())
       tgt.addIdentifier(Identifier40_50.convertIdentifier(t));
     if (src.hasUrl()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.url", Uri40_50.convertUri(src.getUrlElement()));
+      tgt.addExtension(URL_EXTENSION_URL, Uri40_50.convertUri(src.getUrlElement()));
     }
     if (src.hasVersion()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.version", String40_50.convertString(src.getVersionElement()));
+      tgt.addExtension(VERSION_EXTENSION_URL, String40_50.convertString(src.getVersionElement()));
     }
     if (src.hasName()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.name", String40_50.convertString(src.getNameElement()));
+      tgt.addExtension(NAME_EXTENSION_URL, String40_50.convertString(src.getNameElement()));
     }
     if (src.hasTitle()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.title", String40_50.convertString(src.getTitleElement()));
+      tgt.addExtension(TITLE_EXTENSION_URL, String40_50.convertString(src.getTitleElement()));
     }
     if (src.hasStatus()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.status", new org.hl7.fhir.r4.model.CodeType(src.getStatus().toCode()));
+      tgt.addExtension(STATUS_EXTENSION_URL, new org.hl7.fhir.r4.model.CodeType(src.getStatus().toCode()));
     }
     if (src.hasExperimental()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.experimental", Boolean40_50.convertBoolean(src.getExperimentalElement()));
+      tgt.addExtension(EXPERIMENTAL_EXTENSION_URL, Boolean40_50.convertBoolean(src.getExperimentalElement()));
     }
     if (src.hasDate()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.date", DateTime40_50.convertDateTime(src.getDateElement()));
+      tgt.addExtension(DATE_EXTENSION_URL, DateTime40_50.convertDateTime(src.getDateElement()));
     }
     if (src.hasPublisher()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.publisher", String40_50.convertString(src.getPublisherElement()));
+      tgt.addExtension(PUBLISHER_EXTENSION_URL, String40_50.convertString(src.getPublisherElement()));
     }
     for (ContactDetail cd : src.getContact()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.contact", ContactDetail40_50.convertContactDetail(cd));
+      tgt.addExtension(CONTACT_EXTENSION_URL, ContactDetail40_50.convertContactDetail(cd));
     }
     if (src.hasDescription()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.description", MarkDown40_50.convertMarkdown(src.getDescriptionElement()));
+      tgt.addExtension(DESCRIPTION_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getDescriptionElement()));
     }
     for (UsageContext cd : src.getUseContext()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.useContext", UsageContext40_50.convertUsageContext(cd));
+      tgt.addExtension(USE_CONTEXT_EXTENSION_URL, UsageContext40_50.convertUsageContext(cd));
     }
     for (CodeableConcept cd : src.getJurisdiction()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.jurisdiction", CodeableConcept40_50.convertCodeableConcept(cd));
+      tgt.addExtension(JURISDICTION_EXTENSION_URL, CodeableConcept40_50.convertCodeableConcept(cd));
     }
     if (src.hasPurpose()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.purpose", MarkDown40_50.convertMarkdown(src.getPurposeElement()));
+      tgt.addExtension(PURPOSE_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getPurposeElement()));
     }
     if (src.hasCopyright()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyright", MarkDown40_50.convertMarkdown(src.getCopyrightElement()));
+      tgt.addExtension(COPYRIGHT_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getCopyrightElement()));
     }
     if (src.hasCopyrightLabel()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.copyrightLabel", String40_50.convertString(src.getCopyrightLabelElement()));
+      tgt.addExtension(COPYRIGHT_LABEL_EXTENSION_URL, String40_50.convertString(src.getCopyrightLabelElement()));
     }
     if (src.hasType()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.type", new org.hl7.fhir.r4.model.CodeType(src.getType().toCode()));
+      tgt.addExtension(TYPE_EXTENSION_URL, new org.hl7.fhir.r4.model.CodeType(src.getType().toCode()));
     }
     if (src.hasDocumentation()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.documentation", MarkDown40_50.convertMarkdown(src.getDocumentationElement()));
+      tgt.addExtension(DOCUMENTATION_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getDocumentationElement()));
     }   
     for (UrlType ref : src.getReference()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.reference", Url40_50.convertUrl(ref));
+      tgt.addExtension(REFERENCE_EXTENSION_URL, Url40_50.convertUrl(ref));
     }
     if (src.hasCapabilities()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.capabilities", Canonical40_50.convertCanonical(src.getCapabilitiesElement()));
+      tgt.addExtension(CAPABILITIES_EXTENSION_URL, Canonical40_50.convertCanonical(src.getCapabilitiesElement()));
     }   
     for (CanonicalType ct : src.getDerivedFrom()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-ActorDefinition.derivedFrom", Canonical40_50.convertCanonical(ct));
+      tgt.addExtension(DERIVED_FROM_EXTENSION_URL, Canonical40_50.convertCanonical(ct));
     }
 
     return tgt;
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Requirements40_50.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Requirements40_50.java
index 50ac41f5c..65c434ab0 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Requirements40_50.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Requirements40_50.java
@@ -58,6 +58,46 @@ import org.hl7.fhir.r5.model.UsageContext;
 // Generated on Sun, Feb 24, 2019 11:37+1100 for FHIR v4.0.0
 public class Requirements40_50 {
 
+  public static final String URL_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.url";
+  public static final String VERSION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.version";
+  public static final String NAME_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.name";
+  public static final String TITLE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.title";
+  public static final String STATUS_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.status";
+  public static final String EXPERIMENTAL_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.experimental";
+  public static final String DATE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.date";
+  public static final String PUBLISHER_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.publisher";
+  public static final String CONTACT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.contact";
+  public static final String DESCRIPTION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.description";
+  public static final String USE_CONTEXT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.useContext";
+  public static final String JURISDICTION_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.jurisdiction";
+  public static final String PURPOSE_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.purpose";
+  public static final String COPYRIGHT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyright";
+  public static final String COPYRIGHT_LABEL_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyrightLabel";
+  public static final String DERIVED_FROM_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.derivedFrom";
+  public static final String ACTOR_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.actor";
+  public static final String STATEMENT_EXTENSION_URL = "http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.statement";
+
+  private static final String[] IGNORED_EXTENSION_URLS = new String[]{
+    URL_EXTENSION_URL,
+    VERSION_EXTENSION_URL,
+    NAME_EXTENSION_URL,
+    TITLE_EXTENSION_URL,
+    STATUS_EXTENSION_URL,
+    EXPERIMENTAL_EXTENSION_URL,
+    DATE_EXTENSION_URL,
+    PUBLISHER_EXTENSION_URL,
+    CONTACT_EXTENSION_URL,
+    DESCRIPTION_EXTENSION_URL,
+    USE_CONTEXT_EXTENSION_URL,
+    JURISDICTION_EXTENSION_URL,
+    PURPOSE_EXTENSION_URL,
+    COPYRIGHT_EXTENSION_URL,
+    COPYRIGHT_LABEL_EXTENSION_URL,
+    DERIVED_FROM_EXTENSION_URL,
+    ACTOR_EXTENSION_URL,
+    STATEMENT_EXTENSION_URL
+  };
+
   public static org.hl7.fhir.r5.model.Requirements convertRequirements(org.hl7.fhir.r4.model.Basic src) throws FHIRException {
     if (src == null)
       return null;
@@ -65,64 +105,64 @@ public class Requirements40_50 {
       throw new FHIRException("Error in logic: this basic resource is not an Requirements");
     }
     org.hl7.fhir.r5.model.Requirements tgt = new org.hl7.fhir.r5.model.Requirements();
-    //FIXME add ignore
-    ConversionContext40_50.INSTANCE.getVersionConvertor_40_50().copyDomainResource(src, tgt);
+
+    ConversionContext40_50.INSTANCE.getVersionConvertor_40_50().copyDomainResource(src, tgt, IGNORED_EXTENSION_URLS);
     
     for (org.hl7.fhir.r4.model.Identifier t : src.getIdentifier())
       tgt.addIdentifier(Identifier40_50.convertIdentifier(t));
 
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.url")) {
-      tgt.setUrlElement(Uri40_50.convertUri((org.hl7.fhir.r4.model.UriType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.url").getValue()));
+    if (src.hasExtension(URL_EXTENSION_URL)) {
+      tgt.setUrlElement(Uri40_50.convertUri((org.hl7.fhir.r4.model.UriType) src.getExtensionByUrl(URL_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.version")) {
-      tgt.setVersionElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.version").getValue()));
+    if (src.hasExtension(VERSION_EXTENSION_URL)) {
+      tgt.setVersionElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(VERSION_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.name")) {
-      tgt.setNameElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.name").getValue()));
+    if (src.hasExtension(NAME_EXTENSION_URL)) {
+      tgt.setNameElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(NAME_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.title")) {
-      tgt.setTitleElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.title").getValue()));
+    if (src.hasExtension(TITLE_EXTENSION_URL)) {
+      tgt.setTitleElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(TITLE_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.status")) {
-      tgt.setStatus(PublicationStatus.fromCode(src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.status").getValue().primitiveValue()));
+    if (src.hasExtension(STATUS_EXTENSION_URL)) {
+      tgt.setStatus(PublicationStatus.fromCode(src.getExtensionByUrl(STATUS_EXTENSION_URL).getValue().primitiveValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.experimental")) {
-      tgt.setExperimentalElement(Boolean40_50.convertBoolean((org.hl7.fhir.r4.model.BooleanType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.experimental").getValue()));
+    if (src.hasExtension(EXPERIMENTAL_EXTENSION_URL)) {
+      tgt.setExperimentalElement(Boolean40_50.convertBoolean((org.hl7.fhir.r4.model.BooleanType) src.getExtensionByUrl(EXPERIMENTAL_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.date")) {
-      tgt.setDateElement(DateTime40_50.convertDateTime((org.hl7.fhir.r4.model.DateTimeType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.date").getValue()));
+    if (src.hasExtension(DATE_EXTENSION_URL)) {
+      tgt.setDateElement(DateTime40_50.convertDateTime((org.hl7.fhir.r4.model.DateTimeType) src.getExtensionByUrl(DATE_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.publisher")) {
-      tgt.setPublisherElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.publisher").getValue()));
+    if (src.hasExtension(PUBLISHER_EXTENSION_URL)) {
+      tgt.setPublisherElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(PUBLISHER_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.contact")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(CONTACT_EXTENSION_URL)) {
       tgt.addContact(ContactDetail40_50.convertContactDetail((org.hl7.fhir.r4.model.ContactDetail) ext.getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.description")) {
-      tgt.setPublisherElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.description").getValue()));
+    if (src.hasExtension(DESCRIPTION_EXTENSION_URL)) {
+      tgt.setPublisherElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(DESCRIPTION_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.useContext")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(USE_CONTEXT_EXTENSION_URL)) {
       tgt.addUseContext(UsageContext40_50.convertUsageContext((org.hl7.fhir.r4.model.UsageContext) ext.getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.jurisdiction")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(JURISDICTION_EXTENSION_URL)) {
       tgt.addJurisdiction(CodeableConcept40_50.convertCodeableConcept((org.hl7.fhir.r4.model.CodeableConcept) ext.getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.purpose")) {
-      tgt.setPurposeElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.purpose").getValue()));
+    if (src.hasExtension(PURPOSE_EXTENSION_URL)) {
+      tgt.setPurposeElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(PURPOSE_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyright")) {
-      tgt.setCopyrightElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyright").getValue()));
+    if (src.hasExtension(COPYRIGHT_EXTENSION_URL)) {
+      tgt.setCopyrightElement(MarkDown40_50.convertMarkdown((org.hl7.fhir.r4.model.MarkdownType) src.getExtensionByUrl(COPYRIGHT_EXTENSION_URL).getValue()));
     }
-    if (src.hasExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyrightLabel")) {
-      tgt.setCopyrightLabelElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyrightLabel").getValue()));
+    if (src.hasExtension(COPYRIGHT_LABEL_EXTENSION_URL)) {
+      tgt.setCopyrightLabelElement(String40_50.convertString((org.hl7.fhir.r4.model.StringType) src.getExtensionByUrl(COPYRIGHT_LABEL_EXTENSION_URL).getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.derivedFrom")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(DERIVED_FROM_EXTENSION_URL)) {
       tgt.getDerivedFrom().add(Canonical40_50.convertCanonical((org.hl7.fhir.r4.model.CanonicalType) ext.getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.actor")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(ACTOR_EXTENSION_URL)) {
       tgt.getActor().add(Canonical40_50.convertCanonical((org.hl7.fhir.r4.model.CanonicalType) ext.getValue()));
     }
-    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.statement")) {
+    for (org.hl7.fhir.r4.model.Extension ext : src.getExtensionsByUrl(STATEMENT_EXTENSION_URL)) {
       convertRequirementsStatement(ext, tgt.addStatement());
     }
     return tgt;
@@ -139,58 +179,58 @@ public class Requirements40_50 {
     for (org.hl7.fhir.r5.model.Identifier t : src.getIdentifier())
       tgt.addIdentifier(Identifier40_50.convertIdentifier(t));
     if (src.hasUrl()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.url", Uri40_50.convertUri(src.getUrlElement()));
+      tgt.addExtension(URL_EXTENSION_URL, Uri40_50.convertUri(src.getUrlElement()));
     }
     if (src.hasVersion()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.version", String40_50.convertString(src.getVersionElement()));
+      tgt.addExtension(VERSION_EXTENSION_URL, String40_50.convertString(src.getVersionElement()));
     }
     if (src.hasName()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.name", String40_50.convertString(src.getNameElement()));
+      tgt.addExtension(NAME_EXTENSION_URL, String40_50.convertString(src.getNameElement()));
     }
     if (src.hasTitle()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.title", String40_50.convertString(src.getTitleElement()));
+      tgt.addExtension(TITLE_EXTENSION_URL, String40_50.convertString(src.getTitleElement()));
     }
     if (src.hasStatus()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.status", new org.hl7.fhir.r4.model.CodeType(src.getStatus().toCode()));
+      tgt.addExtension(STATUS_EXTENSION_URL, new org.hl7.fhir.r4.model.CodeType(src.getStatus().toCode()));
     }
     if (src.hasExperimental()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.experimental", Boolean40_50.convertBoolean(src.getExperimentalElement()));
+      tgt.addExtension(EXPERIMENTAL_EXTENSION_URL, Boolean40_50.convertBoolean(src.getExperimentalElement()));
     }
     if (src.hasDate()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.date", DateTime40_50.convertDateTime(src.getDateElement()));
+      tgt.addExtension(DATE_EXTENSION_URL, DateTime40_50.convertDateTime(src.getDateElement()));
     }
     if (src.hasPublisher()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.publisher", String40_50.convertString(src.getPublisherElement()));
+      tgt.addExtension(PUBLISHER_EXTENSION_URL, String40_50.convertString(src.getPublisherElement()));
     }
     for (ContactDetail cd : src.getContact()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.contact", ContactDetail40_50.convertContactDetail(cd));
+      tgt.addExtension(CONTACT_EXTENSION_URL, ContactDetail40_50.convertContactDetail(cd));
     }
     if (src.hasDescription()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.description", MarkDown40_50.convertMarkdown(src.getDescriptionElement()));
+      tgt.addExtension(DESCRIPTION_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getDescriptionElement()));
     }
     for (UsageContext cd : src.getUseContext()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.useContext", UsageContext40_50.convertUsageContext(cd));
+      tgt.addExtension(USE_CONTEXT_EXTENSION_URL, UsageContext40_50.convertUsageContext(cd));
     }
     for (CodeableConcept cd : src.getJurisdiction()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.jurisdiction", CodeableConcept40_50.convertCodeableConcept(cd));
+      tgt.addExtension(JURISDICTION_EXTENSION_URL, CodeableConcept40_50.convertCodeableConcept(cd));
     }
     if (src.hasPurpose()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.purpose", MarkDown40_50.convertMarkdown(src.getPurposeElement()));
+      tgt.addExtension(PURPOSE_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getPurposeElement()));
     }
     if (src.hasCopyright()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyright", MarkDown40_50.convertMarkdown(src.getCopyrightElement()));
+      tgt.addExtension(COPYRIGHT_EXTENSION_URL, MarkDown40_50.convertMarkdown(src.getCopyrightElement()));
     }
     if (src.hasCopyrightLabel()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.copyrightLabel", String40_50.convertString(src.getCopyrightLabelElement()));
+      tgt.addExtension(COPYRIGHT_LABEL_EXTENSION_URL, String40_50.convertString(src.getCopyrightLabelElement()));
     }
     for (CanonicalType ref : src.getDerivedFrom()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.derivedFrom", Canonical40_50.convertCanonical(ref));
+      tgt.addExtension(DERIVED_FROM_EXTENSION_URL, Canonical40_50.convertCanonical(ref));
     }
     for (CanonicalType ref : src.getActor()) {
-      tgt.addExtension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.actor", Canonical40_50.convertCanonical(ref));
+      tgt.addExtension(ACTOR_EXTENSION_URL, Canonical40_50.convertCanonical(ref));
     }
     for (RequirementsStatementComponent ref : src.getStatement()) {
-      org.hl7.fhir.r4.model.Extension tgte = new org.hl7.fhir.r4.model.Extension("http://hl7.org/fhir/5.0/StructureDefinition/extension-Requirements.statement");
+      org.hl7.fhir.r4.model.Extension tgte = new org.hl7.fhir.r4.model.Extension(STATEMENT_EXTENSION_URL);
       tgt.addExtension(tgte);
       convertRequirementsStatement(ref, tgte);
     }
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Resource40_50.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Resource40_50.java
index 468fb4170..d425b4d8e 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Resource40_50.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv40_50/resources40_50/Resource40_50.java
@@ -11,6 +11,8 @@ import org.hl7.fhir.convertors.conv40_50.datatypes40_50.special40_50.Narrative40
 import org.hl7.fhir.exceptions.FHIRException;
 import org.hl7.fhir.r4.model.Basic;
 
+import java.util.Arrays;
+
 public class Resource40_50 {
 
   public final BaseAdvisor_40_50 advisor;
@@ -525,7 +527,7 @@ public class Resource40_50 {
     }
   }
 
-  public void copyDomainResource(org.hl7.fhir.r4.model.DomainResource src, org.hl7.fhir.r5.model.DomainResource tgt) throws FHIRException {
+  public void copyDomainResource(org.hl7.fhir.r4.model.DomainResource src, org.hl7.fhir.r5.model.DomainResource tgt, String... ignoredExtensionUrls) throws FHIRException {
     copyResource(src, tgt);
     if (src.hasText()) tgt.setText(Narrative40_50.convertNarrative(src.getText()));
     src.getContained().stream()
@@ -536,7 +538,7 @@ public class Resource40_50 {
         org.hl7.fhir.r5.model.Extension convertExtension = new org.hl7.fhir.r5.model.Extension();
         advisor.handleExtension(ConversionContext40_50.INSTANCE.path(), extension, convertExtension);
         tgt.addExtension(convertExtension);
-      } else if (!advisor.ignoreExtension(ConversionContext40_50.INSTANCE.path(), extension)) {
+      } else if (!advisor.ignoreExtension(ConversionContext40_50.INSTANCE.path(), extension) && !Arrays.asList(ignoredExtensionUrls).contains(extension.getUrl())) {
         tgt.addExtension(Extension40_50.convertExtension(extension));
       }
     });
@@ -546,7 +548,7 @@ public class Resource40_50 {
       .forEach(tgt::addModifierExtension);
   }
 
-  public void copyDomainResource(org.hl7.fhir.r5.model.DomainResource src, org.hl7.fhir.r4.model.DomainResource tgt) throws FHIRException {
+  public void copyDomainResource(org.hl7.fhir.r5.model.DomainResource src, org.hl7.fhir.r4.model.DomainResource tgt,  String... ignoredExtensionUrls) throws FHIRException {
     copyResource(src, tgt);
     if (src.hasText()) tgt.setText(Narrative40_50.convertNarrative(src.getText()));
     src.getContained().stream()
@@ -557,7 +559,7 @@ public class Resource40_50 {
         org.hl7.fhir.r4.model.Extension convertExtension = new org.hl7.fhir.r4.model.Extension();
         advisor.handleExtension(ConversionContext40_50.INSTANCE.path(), extension, convertExtension);
         tgt.addExtension(convertExtension);
-      } else if (!advisor.ignoreExtension(ConversionContext40_50.INSTANCE.path(), extension)) {
+      } else if (!advisor.ignoreExtension(ConversionContext40_50.INSTANCE.path(), extension) && !Arrays.asList(ignoredExtensionUrls).contains(extension.getUrl())) {
         tgt.addExtension(Extension40_50.convertExtension(extension));
       }
     });