diff --git a/src/rad/resources/schemas/mosaic_basic-1.0.0.yaml b/src/rad/resources/schemas/mosaic_basic-1.0.0.yaml
index f90d4cb2..f70091d9 100644
--- a/src/rad/resources/schemas/mosaic_basic-1.0.0.yaml
+++ b/src/rad/resources/schemas/mosaic_basic-1.0.0.yaml
@@ -57,6 +57,16 @@ properties:
     archive_catalog:
       datatype: float
       destination: [ScienceCommon.mean_exposure_time]
+  model_type:
+    title: Type of data model
+    type: string
+    sdf:
+      special_processing: VALUE_REQUIRED
+      source:
+        origin: TBD
+    archive_catalog:
+      datatype: nvarchar(50)
+      destination: [ScienceCommon.model_type, GuideWindow.model_type]
   visit:
     title: Visit number within the observation, defined range of
            values is 1..999; included in obs_id and visit_id as 'VVV'.
@@ -150,10 +160,10 @@ properties:
       datatype: nvarchar(25)
       destination: [ScienceCommon.product_type]
 propertyOrder: [ time_first_mjd, time_last_mjd, time_mean_mjd, max_exposure_time,
-                 mean_exposure_time, visit, segment, pass_number, program, survey, optical_element,
-                 instrument, telescope, location_name, product_type ]
+                 mean_exposure_time, model_type, visit, segment, pass_number, program,
+                 survey, optical_element, instrument, telescope, location_name, product_type ]
 flowStyle: block
 required: [ time_first_mjd, time_last_mjd, time_mean_mjd, max_exposure_time,
-            mean_exposure_time, visit, segment, pass_number, program, survey, optical_element,
-            instrument, telescope, location_name, product_type ]
+            mean_exposure_time, model_type, visit, segment, pass_number, program,
+            survey, optical_element, instrument, telescope, location_name, product_type ]
 ...