[FIX] Add coordsystem-specific definition of DigitizedHeadPoints (#1023)

* Add coordsystem-specific definition of DigitizedHeadpoints. * Use new file_relative format.
bids-standard · Apr 6, 2022 · 0b54380 · 0b54380
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diff --git a/src/04-modality-specific-files/02-magnetoencephalography.md b/src/04-modality-specific-files/02-magnetoencephalography.md
@@ -434,7 +434,7 @@ and a guide for using macros can be found at
 -->
 {{ MACROS___make_metadata_table(
    {
-      "DigitizedHeadPoints": "OPTIONAL",
+      "DigitizedHeadPoints__coordsystem": "OPTIONAL",
       "DigitizedHeadPointsCoordinateSystem": "OPTIONAL",
       "DigitizedHeadPointsCoordinateUnits": "OPTIONAL",
       "DigitizedHeadPointsCoordinateSystemDescription": "OPTIONAL, but REQUIRED if `DigitizedHeadPointsCoordinateSystem` is `Other`",

diff --git a/src/schema/objects/metadata.yaml b/src/schema/objects/metadata.yaml
@@ -533,6 +533,15 @@ DigitizedHeadPoints:
     `true` or `false` value indicating whether head points outlining the
     scalp/face surface are contained within this recording.
   type: boolean
+DigitizedHeadPoints__coordsystem:
+  name: DigitizedHeadPoints
+  description: |
+    Relative path to the file containing the locations of digitized head points
+    collected during the session (for example, `"sub-01_headshape.pos"`).
+    RECOMMENDED for all MEG systems, especially for CTF and BTi/4D.
+    For Elekta/Neuromag the head points will be stored in the fif file.
+  type: string
+  format: file_relative
 DigitizedHeadPointsCoordinateSystem:
   name: DigitizedHeadPointsCoordinateSystem
   description: |