olabusayoT commented on code in PR #1577:
URL: https://github.com/apache/daffodil/pull/1577#discussion_r2524381989


##########
daffodil-core/src/main/scala/org/apache/daffodil/core/grammar/ElementBaseGrammarMixin.scala:
##########
@@ -81,6 +82,20 @@ trait ElementBaseGrammarMixin
     }
   }
 
+  final lazy val checkDelimitedLengthEVDP: Unit = {
+    if (
+      optionEmptyValueDelimiterPolicy.isDefined
+      && emptyValueDelimiterPolicy != EmptyValueDelimiterPolicy.Both
+      && (hasInitiator || hasTerminator)
+    ) {
+      SDW(
+        WarnID.EmptyValueDelimiterPolicyWarning,
+        "dfdl:emptyValueDelimiterPolicy='%s' will be ignored as it's only 
implemented for 'both'",

Review Comment:
   So turns out we didn't have a tunable, which I thought we did, and since we 
plan to eventually implement EVDP we can figure out if we want to actually 
support backwards compatibility and add a tunable during implementation.
   
   WE took a look at encodingErrorPolicy and it does something similar with a 
nyi warning that is not controlled by a tunable
   
   ```scala
       // DFDL-935 to enable
       schemaDefinitionWarningWhen(
         WarnID.EncodingErrorPolicyError,
         policy == EncodingErrorPolicy.Error,
         "dfdl:encodingErrorPolicy=\"error\" is not yet implemented. The 
'replace' value will be used."
       )
   ```



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