Merge branch 'bids-standard:bep022' into bep022

src/schema/objects/metadata.yaml

@@ -2944,11 +2944,9 @@ ResonantNucleus:
     For multi-nuclei experiments such as <sup>1</sup>H-[<sup>13</sup>C] MR,
     an array can be used: `["1H", "13C"]`.
     Corresponds to DICOM Tag 0018, 9100 `Resonant Nucleus`.
-  anyOf:
-    - type: string
-    - type: array
-      items:
-        type: string
+  type: array
+  items:
+    type: string
 RotationOrder:
   name: RotationOrder
   display_name: RotationOrder
@@ -3506,13 +3504,10 @@ SpectrometerFrequency:
     to the resonant frequency of <sup>1</sup>H.
     For multi-nuclei experiments such as <sup>1</sup>H-[<sup>13</sup>C] MR at 3T,
     an array can be used: `[127.731, 32.125]`.
-  anyOf:
-    - type: number
-      unit: MHz
-    - type: array
-      items:
-        type: number
-        unit: MHz
+  type: array
+  items:
+    type: number
+    unit: MHz
 SpoilingGradientDuration:
   name: SpoilingGradientDuration
   display_name: Spoiling Gradient Duration