--- a/OrthancServer/Sources/ServerEnumerations.h	Wed Oct 02 11:41:01 2024 +0200
+++ b/OrthancServer/Sources/ServerEnumerations.h	Wed Oct 09 11:06:20 2024 +0200
@@ -121,6 +121,40 @@
     ConstraintType_List
   };
 
+  enum ResponseContentFlags
+  {
+    ResponseContentFlags_ID                   = (1 << 0),
+    ResponseContentFlags_Type                 = (1 << 1),
+    ResponseContentFlags_RequestedTags        = (1 << 2),
+    ResponseContentFlags_MainDicomTags        = (1 << 3),
+    ResponseContentFlags_MetadataLegacy       = (1 << 4),    // when "Expand": true -> all metadata are included at root level
+    ResponseContentFlags_AttachmentsLegacy    = (1 << 5),    // when "Expand": true -> include attachments info at instance level
+    ResponseContentFlags_Metadata             = (1 << 6),    // all metadata are listed in a "Metadata" field
+    ResponseContentFlags_Attachments          = (1 << 7),    // all attachments are listed in a "Attachments" field
+    ResponseContentFlags_Status               = (1 << 8),
+    ResponseContentFlags_Parent               = (1 << 9),
+    ResponseContentFlags_Children             = (1 << 10),
+    ResponseContentFlags_Labels               = (1 << 11),
+    ResponseContentFlags_IsStable             = (1 << 12),
+
+    // Some predefined combinations
+    ResponseContentFlags_ExpandTrue  = (ResponseContentFlags_ID |
+                                        ResponseContentFlags_Type |
+                                        ResponseContentFlags_RequestedTags |
+                                        ResponseContentFlags_MainDicomTags |
+                                        ResponseContentFlags_MetadataLegacy |
+                                        ResponseContentFlags_AttachmentsLegacy | 
+                                        ResponseContentFlags_Status | 
+                                        ResponseContentFlags_Parent | 
+                                        ResponseContentFlags_Children | 
+                                        ResponseContentFlags_Labels |
+                                        ResponseContentFlags_IsStable),  // equivalent to "Expand": true
+    
+    ResponseContentFlags_Default = (ResponseContentFlags_ID |
+                                    ResponseContentFlags_Type |
+                                    ResponseContentFlags_RequestedTags) // minimal content as soon as you have a "ResponseContent"
+    
+  };
 
   /**
    * WARNING: Do not change the explicit values in the enumerations
@@ -251,6 +285,8 @@
 
   Verbosity StringToVerbosity(const std::string& str);
 
+  ResponseContentFlags StringToResponseContent(const std::string& str);
+
   std::string EnumerationToString(FileContentType type);
 
   std::string GetFileContentMime(FileContentType type);