diff --git a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/PackageClientTests.java b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/PackageClientTests.java
index 6376b2425..fed14f812 100644
--- a/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/PackageClientTests.java
+++ b/org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/PackageClientTests.java
@@ -71,7 +71,6 @@ public class PackageClientTests {
     }
     Assert.assertTrue(matches.size() > 0);
   }
-  
 
   @Test
   public void testSearchNoMatches2() throws IOException {
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/InstanceValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/InstanceValidator.java
index f7205b412..649f46187 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/InstanceValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/InstanceValidator.java
@@ -3716,11 +3716,21 @@ public class InstanceValidator extends BaseValidator implements IResourceValidat
       Element div = text.getNamedChild("div");
       if (lang != null && div != null) {
         XhtmlNode xhtml = div.getXhtml();
-        String xl = xhtml.getAttribute("lang");
-        if (xl == null) {
-          warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language, but the XHTML does not have a language tag");           
-        } else if (!xl.equals(lang)) {
-          warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language ("+lang+"), and the XHTML has a language ("+xl+"), but they differ ");           
+        String l = xhtml.getAttribute("lang");
+        String xl = xhtml.getAttribute("xml:lang");
+        if (l == null && xl == null) {
+          warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language, but the XHTML does not have an lang or an xml:lang tag (needs both - see https://www.w3.org/TR/i18n-html-tech-lang/#langvalues)");           
+        } else { 
+          if (l == null) {
+            warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language, but the XHTML does not have a lang tag (needs both lang and xml:lang - see https://www.w3.org/TR/i18n-html-tech-lang/#langvalues)");           
+          } else if (!l.equals(lang)) {
+            warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language ("+lang+"), and the XHTML has a lang ("+l+"), but they differ ");
+          }
+          if (xl == null) {
+            warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language, but the XHTML does not have an xml:lang tag (needs both lang and xml:lang - see https://www.w3.org/TR/i18n-html-tech-lang/#langvalues)");           
+          } else if (!xl.equals(lang)) {
+            warning(errors, IssueType.BUSINESSRULE, div.line(), div.col(), stack.getLiteralPath(), false, "Resource has a language ("+lang+"), and the XHTML has an xml:lang ("+xl+"), but they differ ");           
+          }
         }
       }
     }