stevedlawrence commented on a change in pull request #273: WIP: Add User 
Defined Functions Capability
URL: https://github.com/apache/incubator-daffodil/pull/273#discussion_r331474556
 
 

 ##########
 File path: 
daffodil-core/src/main/scala/org/apache/daffodil/dpath/Expression.scala
 ##########
 @@ -1870,6 +1871,47 @@ case class FunctionCallExpression(functionQNameString: 
String, expressions: List
       case (RefQName(_, "unsignedByte", XSD), args) =>
         XSConverterExpr(functionQNameString, functionQName, args, 
NodeInfo.UnsignedByte)
 
+      case (RefQName(Some(_), _, _), args) => {
+        val namespace = functionQName.namespace.toString()
+        val fName = functionQName.local
+
+        lazy val udfservice = {
+          val a = UDFService
+          a.warnings.map { w => SDW(WarnID.UserDefinedFunction, w) }
+          val allErrors = a.errors.mkString("\n\n")
+          SDE(s"Function unknown: fname[${fName}] 
fnamespace[${namespace}].\n$allErrors")
+          a
+        }
+
+        val fcObject = udfservice.udfs.lookupFunctionClass(namespace, fName)
+
+        if (fcObject == null) {
+          SDE("Function not found: fname[%s] fnamespace[%s]. Currently 
registered UDFs:\n%s", fName, namespace, udfservice.allFunctionClasses)
 
 Review comment:
   I imagine most cases people will not have any UDF's registered. So this will 
just say "Curently registered UDFS:" and then be empty. Which is a bit 
confusing. Maybe we should just log all registered UDFs to LogLevel.Info and if 
people really want the list they can enable that? Also, change the error to 
something like "namespace:fName"

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