feat(schema): Validate the iEEG data files have associated electrodes.tsv

src/schema/meta/associations.yaml

@@ -82,6 +82,15 @@ channels:
     extension: .tsv
   inherit: true
 
+electrodes:
+  selectors:
+    - intersects([suffix], ['eeg', 'ieeg', 'meg'])
+    - extension != '.json'
+  target:
+    suffix: electrodes
+    extension: .tsv
+  inherit: true
+
 coordsystem:
   selectors:
     - intersects([suffix], ['eeg', 'ieeg', 'meg', 'nirs', 'motion', 'electrodes', 'optodes'])

src/schema/meta/context.yaml

@@ -269,6 +269,15 @@ properties:
             type: array
             items:
               type: string
+      electrodes:
+        description: 'Electrodes file'
+        type: object
+        required: [path]
+        additionalProperties: false
+        properties:
+          path:
+            description: 'Path to associated electrodes file'
+            type: string
       coordsystem:
         description: 'Coordinate system file'
         type: object

src/schema/rules/checks/ieeg.yaml

@@ -0,0 +1,14 @@
+---
+iEEGElectrodesRequired:
+  issue:
+    code: IEEG_ELECTRODES_REQUIRED
+    message: |
+      iEEG data files must have an associated electrodes.tsv.
+      A single electrodes file may apply to multiple data files
+      via the inheritance principle.
+    level: error
+  selectors:
+    - suffix == "ieeg"
+    - extension != ".json"
+  checks:
+    - associations.electrodes.path != ""