olabusayoT commented on code in PR #1366:
URL: https://github.com/apache/daffodil/pull/1366#discussion_r1858825805


##########
daffodil-core/src/main/scala/org/apache/daffodil/core/dsom/AnnotatedSchemaComponent.scala:
##########
@@ -377,6 +378,118 @@ trait AnnotatedSchemaComponent
     val res = schemaDocument.formatAnnotation.formatChain
     res
   }
+
+  /**
+   * Used to propagate used properties through all element/group references, 
element declarations
+   * and simple types. This is necessary because we have elements being 
referenced
+   * by multiple element ref, where the first element gets its propCache 
populated with
+   * the properties its used, and the second element doesn't because of 
sharing. With
+   * this val, we copy used properties from element refs to elements, group 
refs to groups,
+   * from elements to their simple types, if the simple type is annotated with 
the property,
+   * and from simple types to their base types
+   */
+  final lazy val propagateUsedProperties: Unit = {
+    this match {
+      case ref: GroupRef =>
+        val groupBeingReferenced = ref.groupDef
+        // if the groupBeingReferenced carries the property then add the 
property to its propCache
+        ref.propCache.foreach { kv =>
+          if 
(groupBeingReferenced.formatAnnotation.justThisOneProperties.contains(kv._1)) {
+            groupBeingReferenced.propCache.put(kv._1, kv._2)
+          }
+        }
+      case ref: AbstractElementRef =>
+        val elementBeingReferenced = ref.optReferredToComponent.get
+        ref.propCache.foreach(kv =>
+          // if the elementBeingReferenced or its simpleType carries the 
property
+          // then add the property to its propCache
+          if (
+            
elementBeingReferenced.formatAnnotation.justThisOneProperties.contains(kv._1)
+            || elementBeingReferenced.optSimpleType.exists {
+              case std: SimpleTypeDefBase =>
+                std.formatAnnotation.justThisOneProperties.contains(kv._1)
+              case _ => false
+            }
+          ) {
+            // only add the used properties that the elementBeingReferenced or 
its simple type carries,
+            // not any local properties that aren't shared
+            elementBeingReferenced.propCache.put(kv._1, kv._2)
+            // propagate used properties from element to its simpletype and 
vice versa
+            elementBeingReferenced.propagateUsedProperties
+          }
+        )
+      case ele: ElementDeclMixin =>
+        val ost = ele.optSimpleType
+        ost.collect { case std: SimpleTypeDefBase =>
+          // if the type has used properties transfer it to the element that's 
using it
+          // we don't need the check for what it carries since all properties 
on the type are shared
+          // by the element using it
+          std.propCache.foreach(kv => ele.propCache.put(kv._1, kv._2))
+          // copy the used properties from the element to the type
+          ele.propCache.foreach(kv =>
+            if (std.formatAnnotation.justThisOneProperties.contains(kv._1)) {
+              // only add the used properties that the simple type carries, 
not any local element properties that aren't shared
+              std.propCache.put(kv._1, kv._2)
+            }
+          )
+          // propagate through the element's simple type base chain
+          std.propagateUsedProperties

Review Comment:
   > structure of just the properties that are used so as to isolate from those 
that are unused
   
   Propcache only contains used properties. We don't add in any unused 
properties
   
   > olds only properties in the referencer's propCache that are NOT found in 
the referenced object's propCache, so that this new structure is not redundant 
with the contents of the propCache.
   
   Doesn't that mean checkUnunsedProperties would have to check propCache as 
well as this new structure?



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