diff --git a/library/cda/cda_base.pas b/library/cda/cda_base.pas
index 78e653e39..865bd81bc 100644
--- a/library/cda/cda_base.pas
+++ b/library/cda/cda_base.pas
@@ -734,7 +734,7 @@ constructor Tv3PropertyDefinition.CreateBoolean(oOwner: Tv3Base; bIsStructural :
   FCollectionState := rmpctNone;
   FIsStructural := bIsStructural;
   if bHasValue Then
-    FValueString := BoolToStr(bValue);
+    FValueString := BoolToStr(bValue, true).ToLower;
 end;
 
 
diff --git a/library/cda/cda_writer.pas b/library/cda/cda_writer.pas
index f9d3260bb..538345641 100644
--- a/library/cda/cda_writer.pas
+++ b/library/cda/cda_writer.pas
@@ -301,7 +301,7 @@ procedure TCDAWriter.WriteCDA(oXml: TXmlBuilder; oDoc: TcdaClinicalDocument);
 
 Procedure TCDAWriter.WriteANYAttributes(Const sPath: string; oXml : TXmlBuilder; oDT : Tv3ANY);
 Begin
-  Attribute(sPath, oXml, 'nullFLavor', writeNullFlavor(sPath, oDt.NullFlavor), true);
+  Attribute(sPath, oXml, 'nullFlavor', writeNullFlavor(sPath, oDt.NullFlavor), true);
   // ignore updateMode and flavorId for now
 End;
 
@@ -316,7 +316,7 @@ procedure TCDAWriter.WriteCDA(oXml: TXmlBuilder; oDoc: TcdaClinicalDocument);
   WriteComments(oXml, oDT);
   WriteANYAttributes(sPath, oXml, oDT);
   if oDT.HasValue Then
-    Attribute(sPath, oXml, 'value', BoolToStr(oDT.value), true);
+    Attribute(sPath, oXml, 'value', BoolToStr(oDT.value, true).ToLower, true);
   oDT.sourcelocation := oXml.Tag(sName);
 End;
 
@@ -349,7 +349,7 @@ procedure TCDAWriter.WriteCDA(oXml: TXmlBuilder; oDoc: TcdaClinicalDocument);
   Attribute(sPath, oXml, 'extension', oDT.extension, true);
   Attribute(sPath, oXml, 'assigningAuthorityName', oDT.identifierName, true);
   if oDT.hasDisplayable Then
-    Attribute(sPath, oXml, 'displayable', BoolToStr(oDT.displayable), true);
+    Attribute(sPath, oXml, 'displayable', BoolToStr(oDT.displayable, true).ToLower, true);
   Attribute(sPath, oXml, 'scope', CODES_Tv3IdentifierScope[oDT.scope], true);
   Attribute(sPath, oXml, 'reliability', CODES_Tv3IdentifierReliability[oDT.reliability], true);
   oDT.sourcelocation := oXml.Tag(sName);