--- a/OrthancServer/Plugins/Engine/OrthancPluginDatabaseV4.cpp	Fri Dec 13 08:48:47 2024 +0100
+++ b/OrthancServer/Plugins/Engine/OrthancPluginDatabaseV4.cpp	Mon Dec 16 11:24:49 2024 +0100
@@ -339,21 +339,13 @@
     for (int i = 0; i < source.main_dicom_tags().size(); i++)
     {
       const DicomTag tag(source.main_dicom_tags(i).group(), source.main_dicom_tags(i).element());
-
-      for (int j = 0; j < source.main_dicom_tags(i).values().size(); j++)
-      {
-        target.AddChildrenMainDicomTagValue(level, tag, source.main_dicom_tags(i).values(j));
-      }
+      target.AddChildrenMainDicomTagValue(level, tag, source.main_dicom_tags(i).value());
     }
 
     for (int i = 0; i < source.metadata().size(); i++)
     {
       MetadataType key = static_cast<MetadataType>(source.metadata(i).key());
-
-      for (int j = 0; j < source.metadata(i).values().size(); j++)
-      {
-        target.AddChildrenMetadataValue(level, key, source.metadata(i).values(j));
-      }
+      target.AddChildrenMetadataValue(level, key, source.metadata(i).value());
     }
   }
 

--- a/OrthancServer/Plugins/Include/orthanc/OrthancDatabasePlugin.proto	Fri Dec 13 08:48:47 2024 +0100
+++ b/OrthancServer/Plugins/Include/orthanc/OrthancDatabasePlugin.proto	Mon Dec 16 11:24:49 2024 +0100
@@ -929,23 +929,14 @@
       string value = 2;
       int64 revision = 3;
     }
-    message MultipleTags {
-      uint32 group = 1;
-      uint32 element = 2;
-      repeated string values = 3;
-    }
-    message MultipleMetadata {
-      int32 key = 1;
-      repeated string values = 2;
-    }
     message ResourceContent {
       repeated Tag main_dicom_tags = 1;
       repeated Metadata metadata = 2;
     }
     message ChildrenContent {
       repeated string identifiers = 1;
-      repeated MultipleTags main_dicom_tags = 2;
-      repeated MultipleMetadata metadata = 3;
+      repeated Tag main_dicom_tags = 2;
+      repeated Metadata metadata = 3;  // As of Orthanc 1.12.5, the "revision" field is unused in this case
       uint64 count = 4;
     }