BulkURI-consistency-check-rule.md

+The link between a record (a WellLog for instance) and its associated bulk data is done via a field within the record.  The field is inside the `wdms` extension properties and is named `bulkURI`.
+
+Example:
+
+````python
+# WellLog record
+
+{
+  "data": {
+	...,
+	{
+		"ExtensionProperties": {
+			# WDMS specific extension properties
+			"wdms": {
+				# reference to associated bulk data
+				"bulkURI": "urn:uuid:489768d2-eee1-4a8f-ae95-7b0c30b0dcd8"
+			}
+		}
+	}
+  },
+  "kind": "osdu:wks:work-product-component--WellLog:1.1.0",
+  "acl": ...,
+  "legal": ...
+  ...
+}
+````
+
+This field is managed by WDMS. The record can still be updated independently by pushing a new version and so the `bulkURI` could be removed or altered by someone, fully unaware. This leads to the lost of the bulk data link.  
+Bulk data are still there and remained associated in previous record versions. However the latest version have no bulk associated or invalid reference to it.
+
+To prevent this, WDMS put in place some rules that check any record creation or update through its APIs doesn't break the integrity of this link:
+
+- case new record ==> `bulkURI` must not be set.
+- case record update ==> `bulkURI` must match one of the previous versions.
+
+