diff --git a/apps/interpreter/test/assets/broken-model.jv b/apps/interpreter/test/assets/broken-model.jv
index ff20db91d..f33bf4339 100644
--- a/apps/interpreter/test/assets/broken-model.jv
+++ b/apps/interpreter/test/assets/broken-model.jv
@@ -44,22 +44,22 @@ pipeline CarsPipeline {
   }
 
   transform CarParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to car oftype Car;
 
     car: {
-      name: asText (r cellInColumn "name"),
-      mpg: asDecimal (r cellInColumn "mpg"),
-      cyl: asInteger (r cellInColumn 2),
-      disp: asDecimal (r cellInColumn 3),
-      hp: asInteger (r cellInColumn "hp"),
-      drat: asDecimal (r cellInColumn "drat"),
-      wt: asDecimal (r cellInColumn "wt"),
-      qsec: asDecimal (r cellInColumn "qsec"),
-      vs: asInteger (r cellInColumn "vs"),
-      am: asInteger (r cellInColumn "am"),
-      gear: asInteger (r cellInColumn "gear"),
-      carb: asInteger (r cellInColumn "carb")
+      name: asText (r . "name"),
+      mpg: asDecimal (r . "mpg"),
+      cyl: asInteger (r . 2),
+      disp: asDecimal (r . 3),
+      hp: asInteger (r . "hp"),
+      drat: asDecimal (r . "drat"),
+      wt: asDecimal (r . "wt"),
+      qsec: asDecimal (r . "qsec"),
+      vs: asInteger (r . "vs"),
+      am: asInteger (r . "am"),
+      gear: asInteger (r . "gear"),
+      carb: asInteger (r . "carb")
     };
   }
 
diff --git a/example/cars.jv b/example/cars.jv
index 4b28eefa4..a16f29d29 100644
--- a/example/cars.jv
+++ b/example/cars.jv
@@ -89,22 +89,22 @@ pipeline CarsPipeline {
   }
 
   transform CarParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to car oftype Car;
 
     car: {
-      name: asText (r cellInColumn "name"),
-      mpg: asDecimal (r cellInColumn "mpg"),
-      cyl: asInteger (r cellInColumn 2),
-      disp: asDecimal (r cellInColumn 3),
-      hp: asInteger (r cellInColumn "hp"),
-      drat: asDecimal (r cellInColumn "drat"),
-      wt: asDecimal (r cellInColumn "wt"),
-      qsec: asDecimal (r cellInColumn "qsec"),
-      vs: asInteger (r cellInColumn "vs"),
-      am: asInteger (r cellInColumn "am"),
-      gear: asInteger (r cellInColumn "gear"),
-      carb: asInteger (r cellInColumn "carb")
+      name: asText (r."name"),
+      mpg: asDecimal (r . "mpg"),
+      cyl: asInteger (r.2),
+      disp: asDecimal (r . 3),
+      hp: asInteger (r . "hp"),
+      drat: asDecimal (r . "drat"),
+      wt: asDecimal (r . "wt"),
+      qsec: asDecimal (r . "qsec"),
+      vs: asInteger (r . "vs"),
+      am: asInteger (r . "am"),
+      gear: asInteger (r . "gear"),
+      carb: asInteger (r . "carb")
     };
   }
 
diff --git a/example/electric-vehicles.jv b/example/electric-vehicles.jv
index 91b05ff75..dc8e4c609 100644
--- a/example/electric-vehicles.jv
+++ b/example/electric-vehicles.jv
@@ -70,27 +70,27 @@ pipeline ElectricVehiclesPipeline {
   }
 
   transform ElectricVehicleParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to ev oftype ElectricVehicle;
 
     ev: {
-      vin: r cellInColumn "VIN (1-10)",
-      county: asText (r cellInColumn "County"),
-      city: asText (r cellInColumn "City"),
-      state: asText (r cellInColumn "State"),
-      postal: asText (r cellInColumn "Postal Code"),
-      modelYear: asInteger (r cellInColumn "Model Year"),
-      make: asText (r cellInColumn "Make"),
-      model: asText (r cellInColumn "Model"),
-      evType: asText (r cellInColumn "Electric Vehicle Type"),
-      cafvEligibility: asText (r cellInColumn "Clean Alternative Fuel Vehicle (CAFV) Eligibility"),
-      electricRange: asInteger (r cellInColumn "Electric Range"),
-      baseMSRP: asInteger (r cellInColumn "Base MSRP"),
-      legislativeDistrict: asText (r cellInColumn "LegislativeDistrict"),
-      dolID: asInteger (r cellInColumn "DOL Vehicle ID"),
-      location: asText (r cellInColumn "Vehicle Location"),
-      utility: asText (r cellInColumn "Electric Utility"),
-      censusTract: asText (r cellInColumn "2020 Census Tract"),
+      vin: r . "VIN (1-10)",
+      county: asText (r . "County"),
+      city: asText (r . "City"),
+      state: asText (r . "State"),
+      postal: asText (r . "Postal Code"),
+      modelYear: asInteger (r . "Model Year"),
+      make: asText (r . "Make"),
+      model: asText (r . "Model"),
+      evType: asText (r . "Electric Vehicle Type"),
+      cafvEligibility: asText (r . "Clean Alternative Fuel Vehicle (CAFV) Eligibility"),
+      electricRange: asInteger (r . "Electric Range"),
+      baseMSRP: asInteger (r . "Base MSRP"),
+      legislativeDistrict: asText (r . "LegislativeDistrict"),
+      dolID: asInteger (r . "DOL Vehicle ID"),
+      location: asText (r . "Vehicle Location"),
+      utility: asText (r . "Electric Utility"),
+      censusTract: asText (r . "2020 Census Tract"),
     };
   }
 
diff --git a/example/gtfs-rt.jv b/example/gtfs-rt.jv
index faa496a8d..67f35ef9c 100644
--- a/example/gtfs-rt.jv
+++ b/example/gtfs-rt.jv
@@ -71,20 +71,20 @@ pipeline GtfsRTSimplePipeline {
     property entityTripUpdateStopTimeUpdateDepartureTime oftype text;
   }
   transform TripUpdateParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to tripUpdate oftype TripUpdate;
 
     tripUpdate: {
-      headerGtfsRealtimeVersion: r cellInColumn "header.gtfs_realtime_version",
-      headerTimestamp: r cellInColumn "header.timestamp",
-      headerIncrementality: r cellInColumn "header.incrementality",
-      entityId: r cellInColumn "entity.id",
-      entityTripUpdateTripTripId: r cellInColumn "entity.trip_update.trip.trip_id",
-      entityTripUpdateTripRouteId: r cellInColumn "entity.trip_update.trip.route_id",
-      entityTripUpdateStopTimeUpdateStopSequence: r cellInColumn "entity.trip_update.stop_time_update.stop_sequence",
-      entityTripUpdateStopTimeUpdateStopId: r cellInColumn "entity.trip_update.stop_time_update.stop_id",
-      entityTripUpdateStopTimeUpdateArrivalTime: r cellInColumn "entity.trip_update.stop_time_update.arrival.time",
-      entityTripUpdateStopTimeUpdateDepartureTime: r cellInColumn "entity.trip_update.stop_time_update.departure.time",
+      headerGtfsRealtimeVersion: r . "header.gtfs_realtime_version",
+      headerTimestamp: r . "header.timestamp",
+      headerIncrementality: r . "header.incrementality",
+      entityId: r . "entity.id",
+      entityTripUpdateTripTripId: r . "entity.trip_update.trip.trip_id",
+      entityTripUpdateTripRouteId: r . "entity.trip_update.trip.route_id",
+      entityTripUpdateStopTimeUpdateStopSequence: r . "entity.trip_update.stop_time_update.stop_sequence",
+      entityTripUpdateStopTimeUpdateStopId: r . "entity.trip_update.stop_time_update.stop_id",
+      entityTripUpdateStopTimeUpdateArrivalTime: r . "entity.trip_update.stop_time_update.arrival.time",
+      entityTripUpdateStopTimeUpdateDepartureTime: r . "entity.trip_update.stop_time_update.departure.time",
     };
   }
   block TripUpdateTableInterpreter oftype TableInterpreter {
@@ -107,20 +107,20 @@ pipeline GtfsRTSimplePipeline {
     property entityVehiclePositionTimestamp oftype text;
   }
   transform VehiclePositionParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to vehiclePosition oftype VehiclePosition;
 
     vehiclePosition: {
-      headerGtfsRealtimeVersion: r cellInColumn "header.gtfs_realtime_version",
-      headerTimestamp: r cellInColumn "header.timestamp",
-      headerIncrementality: r cellInColumn "header.incrementality",
-      entityId: r cellInColumn "entity.id",
-      entityVehiclePositionVehicleDescriptorId: r cellInColumn "entity.vehicle_position.vehicle_descriptor.id",
-      entityVehiclePositionTripTripId: r cellInColumn "entity.vehicle_position.trip.trip_id",
-      entityVehiclePositionTripRouteId: r cellInColumn "entity.vehicle_position.trip.route_id",
-      entityVehiclePositionPositionLatitude: r cellInColumn "entity.vehicle_position.position.latitude",
-      entityVehiclePositionPositionLongitude: r cellInColumn "entity.vehicle_position.position.longitude",
-      entityVehiclePositionTimestamp: r cellInColumn "entity.vehicle_position.timestamp",
+      headerGtfsRealtimeVersion: r . "header.gtfs_realtime_version",
+      headerTimestamp: r . "header.timestamp",
+      headerIncrementality: r . "header.incrementality",
+      entityId: r . "entity.id",
+      entityVehiclePositionVehicleDescriptorId: r . "entity.vehicle_position.vehicle_descriptor.id",
+      entityVehiclePositionTripTripId: r . "entity.vehicle_position.trip.trip_id",
+      entityVehiclePositionTripRouteId: r . "entity.vehicle_position.trip.route_id",
+      entityVehiclePositionPositionLatitude: r . "entity.vehicle_position.position.latitude",
+      entityVehiclePositionPositionLongitude: r . "entity.vehicle_position.position.longitude",
+      entityVehiclePositionTimestamp: r . "entity.vehicle_position.timestamp",
     };
   }
   block VehiclePositionTableInterpreter oftype TableInterpreter {
@@ -140,17 +140,17 @@ pipeline GtfsRTSimplePipeline {
     property entityAlertDescriptionText oftype text;
   }
   transform AlertParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to alert oftype Alert;
 
     alert: {
-        headerGtfsRealtimeVersion: r cellInColumn "header.gtfs_realtime_version",
-        headerTimestamp: r cellInColumn "header.timestamp",
-        headerIncrementality: r cellInColumn "header.incrementality",
-        entityId: r cellInColumn "entity.id",
-        entityAlertInformedEntityRouteId: r cellInColumn "entity.alert.informed_entity.route_id",
-        entityAlertHeaderText: r cellInColumn "entity.alert.header_text",
-        entityAlertDescriptionText: r cellInColumn "entity.alert.description_text",
+        headerGtfsRealtimeVersion: r . "header.gtfs_realtime_version",
+        headerTimestamp: r . "header.timestamp",
+        headerIncrementality: r . "header.incrementality",
+        entityId: r . "entity.id",
+        entityAlertInformedEntityRouteId: r . "entity.alert.informed_entity.route_id",
+        entityAlertHeaderText: r . "entity.alert.header_text",
+        entityAlertDescriptionText: r . "entity.alert.description_text",
       };
   }
   block AlertTableInterpreter oftype TableInterpreter {
diff --git a/libs/execution/src/lib/transforms/transform-executor.ts b/libs/execution/src/lib/transforms/transform-executor.ts
index 955ff63d0..2bbbff8ba 100644
--- a/libs/execution/src/lib/transforms/transform-executor.ts
+++ b/libs/execution/src/lib/transforms/transform-executor.ts
@@ -7,6 +7,7 @@ import { strict as assert } from 'assert';
 
 import {
   ERROR_TYPEGUARD,
+  onlyElementOrUndefined,
   type InternalErrorValueRepresentation,
   type InternalValidValueRepresentation,
   InvalidValue,
@@ -64,9 +65,9 @@ export class TransformExecutor {
 
   getOutputAssignment(): TransformOutputAssignment {
     const outputAssignments = this.transform.body.outputAssignments;
-    assert(outputAssignments.length === 1);
-    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-    return outputAssignments[0]!;
+    const outputAssignment = onlyElementOrUndefined(outputAssignments);
+    assert(outputAssignment !== undefined);
+    return outputAssignment;
   }
 
   executeTransform(
diff --git a/libs/execution/src/lib/types/value-types/internal-representation-parsing.ts b/libs/execution/src/lib/types/value-types/internal-representation-parsing.ts
index 464da9f32..45d0d321b 100644
--- a/libs/execution/src/lib/types/value-types/internal-representation-parsing.ts
+++ b/libs/execution/src/lib/types/value-types/internal-representation-parsing.ts
@@ -147,4 +147,8 @@ class InternalRepresentationParserVisitor extends ValueTypeVisitor<
       `Cannot parse valuetype definitions into internal values`,
     );
   }
+
+  override visitSheetRow(): InvalidValue {
+    return new InvalidValue(`Cannot parse sheet rows into internal values`);
+  }
 }
diff --git a/libs/execution/src/lib/types/value-types/value-representation-validity.ts b/libs/execution/src/lib/types/value-types/value-representation-validity.ts
index c6b87d8d9..add6957d1 100644
--- a/libs/execution/src/lib/types/value-types/value-representation-validity.ts
+++ b/libs/execution/src/lib/types/value-types/value-representation-validity.ts
@@ -6,6 +6,7 @@
 import { strict as assert } from 'assert';
 
 import {
+  type SheetRowValueType,
   type AtomicValueType,
   type BooleanValuetype,
   type CellRangeValuetype,
@@ -130,6 +131,10 @@ class ValueRepresentationValidityVisitor extends ValueTypeVisitor<boolean> {
     return this.isValidForPrimitiveValuetype(valueType);
   }
 
+  override visitSheetRow(valueType: SheetRowValueType): boolean {
+    return this.isValidForPrimitiveValuetype(valueType);
+  }
+
   override visitTransform(valueType: TransformValuetype): boolean {
     return this.isValidForPrimitiveValuetype(valueType);
   }
diff --git a/libs/execution/src/lib/types/value-types/visitors/sql-column-type-visitor.ts b/libs/execution/src/lib/types/value-types/visitors/sql-column-type-visitor.ts
index f47a92e3e..8257f5685 100644
--- a/libs/execution/src/lib/types/value-types/visitors/sql-column-type-visitor.ts
+++ b/libs/execution/src/lib/types/value-types/visitors/sql-column-type-visitor.ts
@@ -76,6 +76,12 @@ export class SQLColumnTypeVisitor extends ValueTypeVisitor<string> {
     );
   }
 
+  override visitSheetRow(): string {
+    throw new Error(
+      'No visit implementation given for sheet rows. Cannot be the type of a column.',
+    );
+  }
+
   override visitTransform(): string {
     throw new Error(
       'No visit implementation given for transforms. Cannot be the type of a column.',
diff --git a/libs/execution/src/lib/types/value-types/visitors/sql-value-representation-visitor.ts b/libs/execution/src/lib/types/value-types/visitors/sql-value-representation-visitor.ts
index 9b6bdba78..a44111932 100644
--- a/libs/execution/src/lib/types/value-types/visitors/sql-value-representation-visitor.ts
+++ b/libs/execution/src/lib/types/value-types/visitors/sql-value-representation-visitor.ts
@@ -130,6 +130,14 @@ export class SQLValueRepresentationVisitor extends ValueTypeVisitor<
     );
   }
 
+  override visitSheetRow(): (
+    value: InternalValidValueRepresentation | InternalErrorValueRepresentation,
+  ) => string {
+    throw new Error(
+      'No visit implementation given for sheet row. Cannot be the type of a column.',
+    );
+  }
+
   override visitTransform(): (
     value: InternalValidValueRepresentation | InternalErrorValueRepresentation,
   ) => string {
diff --git a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-empty-columns-with-header.jv b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-empty-columns-with-header.jv
index d3c3189cd..51f173643 100644
--- a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-empty-columns-with-header.jv
+++ b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-empty-columns-with-header.jv
@@ -12,7 +12,7 @@ pipeline TestPipeline {
 
 
   transform Parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to t oftype TestValueType;
 
     t: { };
diff --git a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-capitalized-header.jv b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-capitalized-header.jv
index 08fc9db23..f867f43a0 100644
--- a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-capitalized-header.jv
+++ b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-capitalized-header.jv
@@ -14,10 +14,10 @@ pipeline TestPipeline {
   }
 
   transform Parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to t oftype TestValueType;
 
-    t: { Index: asInteger (r cellInColumn "Index"), Name: r cellInColumn "Name", Flag: asBoolean (r cellInColumn "Flag") };
+    t: { Index: asInteger (r . "Index"), Name: r . "Name", Flag: asBoolean (r . "Flag") };
   }
 
   block TestBlock oftype TableInterpreter {
diff --git a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-header.jv b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-header.jv
index 4d46a854d..547d3427b 100644
--- a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-header.jv
+++ b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-with-header.jv
@@ -14,10 +14,10 @@ pipeline TestPipeline {
   }
 
   transform Parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to t oftype TestValueType;
 
-    t: { index: asInteger (r cellInColumn "index"), name: r cellInColumn "name", flag: asBoolean (r cellInColumn "flag") };
+    t: { index: asInteger (r . "index"), name: r . "name", flag: asBoolean (r . "flag") };
   }
 
   block TestBlock oftype TableInterpreter {
diff --git a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-without-header.jv b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-without-header.jv
index 9925fd6a0..d3bb3357f 100644
--- a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-without-header.jv
+++ b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-without-header.jv
@@ -14,11 +14,11 @@ pipeline TestPipeline {
   }
 
   transform Parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to t oftype TestValueType;
 
-    t: { index: asInteger (r cellInColumn 0), name: r cellInColumn 1, flag:
-    asBoolean (r cellInColumn 2) };
+    t: { index: asInteger (r . 0), name: r . 1, flag:
+    asBoolean (r . 2) };
   }
 
   block TestBlock oftype TableInterpreter {
diff --git a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-with-header.jv b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-with-header.jv
index 1c480af72..e72e8bb25 100644
--- a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-with-header.jv
+++ b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-with-header.jv
@@ -14,10 +14,10 @@ pipeline TestPipeline {
   }
 
   transform Parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to t oftype TestValueType;
 
-    t: { index: asInteger (r cellInColumn "index"), name: r cellInColumn "name", flag: asBoolean (r cellInColumn "flag") };
+    t: { index: asInteger (r . "index"), name: r . "name", flag: asBoolean (r . "flag") };
   }
 
   block TestBlock oftype TableInterpreter {
diff --git a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-without-header.jv b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-without-header.jv
index 20d65adf8..4f24f35e7 100644
--- a/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-without-header.jv
+++ b/libs/extensions/tabular/exec/test/assets/table-interpreter-executor/valid-wrong-value-type-without-header.jv
@@ -14,11 +14,11 @@ pipeline TestPipeline {
   }
 
   transform Parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to t oftype TestValueType;
 
-    t: { index: asInteger (r cellInColumn 0), name: r cellInColumn 1, flag:
-    asBoolean (r cellInColumn 2) };
+    t: { index: asInteger (r . 0), name: r . 1, flag:
+    asBoolean (r . 2) };
   }
 
   block TestBlock oftype TableInterpreter {
diff --git a/libs/interpreter-lib/test/assets/graph/composite-block.jv b/libs/interpreter-lib/test/assets/graph/composite-block.jv
index 8ba0df960..6e2ac599d 100644
--- a/libs/interpreter-lib/test/assets/graph/composite-block.jv
+++ b/libs/interpreter-lib/test/assets/graph/composite-block.jv
@@ -20,9 +20,9 @@ pipeline CarsPipeline {
   }
 
   transform parser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to y oftype CarName;
-    y: { name: asText (r cellInColumn "name") };
+    y: { name: asText (r . "name") };
   }
 
 	block CarsTableInterpreter oftype TableInterpreter {
diff --git a/libs/interpreter-lib/test/assets/graph/two-pipelines.jv b/libs/interpreter-lib/test/assets/graph/two-pipelines.jv
index c31ce3229..15ed3d7b3 100644
--- a/libs/interpreter-lib/test/assets/graph/two-pipelines.jv
+++ b/libs/interpreter-lib/test/assets/graph/two-pipelines.jv
@@ -47,22 +47,22 @@ pipeline CarsPipeline {
   }
 
   transform CarParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to car oftype Car;
 
     car: {
-      name: asText (r cellInColumn "name"),
-      mpg: asDecimal (r cellInColumn "mpg"),
-      cyl: asInteger (r cellInColumn 2),
-      disp: asDecimal (r cellInColumn 3),
-      hp: asInteger (r cellInColumn "hp"),
-      drat: asDecimal (r cellInColumn "drat"),
-      wt: asDecimal (r cellInColumn "wt"),
-      qsec: asDecimal (r cellInColumn "qsec"),
-      vs: asInteger (r cellInColumn "vs"),
-      am: asInteger (r cellInColumn "am"),
-      gear: asInteger (r cellInColumn "gear"),
-      carb: asInteger (r cellInColumn "carb")
+      name: asText (r . "name"),
+      mpg: asDecimal (r . "mpg"),
+      cyl: asInteger (r . 2),
+      disp: asDecimal (r . 3),
+      hp: asInteger (r . "hp"),
+      drat: asDecimal (r . "drat"),
+      wt: asDecimal (r . "wt"),
+      qsec: asDecimal (r . "qsec"),
+      vs: asInteger (r . "vs"),
+      am: asInteger (r . "am"),
+      gear: asInteger (r . "gear"),
+      carb: asInteger (r . "carb")
     };
   }
 
@@ -127,27 +127,27 @@ pipeline ElectricVehiclesPipeline {
   }
 
   transform ElectricVehicleParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to ev oftype ElectricVehicle;
 
     ev: {
-      vin: r cellInColumn "VIN (1-10)",
-      county: asText (r cellInColumn "County"),
-      city: asText (r cellInColumn "City"),
-      state: asText (r cellInColumn "State"),
-      postal: asText (r cellInColumn "Postal Code"),
-      modelYear: asInteger (r cellInColumn "Model Year"),
-      make: asText (r cellInColumn "Make"),
-      model: asText (r cellInColumn "Model"),
-      evType: asText (r cellInColumn "Electric Vehicle Type"),
-      cafvEligibility: asText (r cellInColumn "Clean Alternative Fuel Vehicle (CAFV) Eligibility"),
-      electricRange: asInteger (r cellInColumn "Electric Range"),
-      baseMSRP: asInteger (r cellInColumn "Base MSRP"),
-      legislativeDistrict: asText (r cellInColumn "Legislative District"),
-      dolID: asInteger (r cellInColumn "DOL Vehicle ID"),
-      location: asText (r cellInColumn "Vehicle Location"),
-      utility: asText (r cellInColumn "Electric Utility"),
-      censusTract: asText (r cellInColumn "2020 Census Tract"),
+      vin: r . "VIN (1-10)",
+      county: asText (r . "County"),
+      city: asText (r . "City"),
+      state: asText (r . "State"),
+      postal: asText (r . "Postal Code"),
+      modelYear: asInteger (r . "Model Year"),
+      make: asText (r . "Make"),
+      model: asText (r . "Model"),
+      evType: asText (r . "Electric Vehicle Type"),
+      cafvEligibility: asText (r . "Clean Alternative Fuel Vehicle (CAFV) Eligibility"),
+      electricRange: asInteger (r . "Electric Range"),
+      baseMSRP: asInteger (r . "Base MSRP"),
+      legislativeDistrict: asText (r . "Legislative District"),
+      dolID: asInteger (r . "DOL Vehicle ID"),
+      location: asText (r . "Vehicle Location"),
+      utility: asText (r . "Electric Utility"),
+      censusTract: asText (r . "2020 Census Tract"),
     };
   }
 
diff --git a/libs/interpreter-lib/test/assets/hooks/valid-builtin-and-composite-blocks.jv b/libs/interpreter-lib/test/assets/hooks/valid-builtin-and-composite-blocks.jv
index 115a62157..1417ff405 100644
--- a/libs/interpreter-lib/test/assets/hooks/valid-builtin-and-composite-blocks.jv
+++ b/libs/interpreter-lib/test/assets/hooks/valid-builtin-and-composite-blocks.jv
@@ -44,22 +44,22 @@ pipeline CarsPipeline {
   }
 
   transform CarParser {
-    from r oftype Collection<text>;
+    from r oftype SheetRow;
     to car oftype Car;
 
     car: {
-      name: asText (r cellInColumn "name"),
-      mpg: asDecimal (r cellInColumn "mpg"),
-      cyl: asInteger (r cellInColumn 2),
-      disp: asDecimal (r cellInColumn 3),
-      hp: asInteger (r cellInColumn "hp"),
-      drat: asDecimal (r cellInColumn "drat"),
-      wt: asDecimal (r cellInColumn "wt"),
-      qsec: asDecimal (r cellInColumn "qsec"),
-      vs: asInteger (r cellInColumn "vs"),
-      am: asInteger (r cellInColumn "am"),
-      gear: asInteger (r cellInColumn "gear"),
-      carb: asInteger (r cellInColumn "carb")
+      name: asText (r . "name"),
+      mpg: asDecimal (r . "mpg"),
+      cyl: asInteger (r . 2),
+      disp: asDecimal (r . 3),
+      hp: asInteger (r . "hp"),
+      drat: asDecimal (r . "drat"),
+      wt: asDecimal (r . "wt"),
+      qsec: asDecimal (r . "qsec"),
+      vs: asInteger (r . "vs"),
+      am: asInteger (r . "am"),
+      gear: asInteger (r . "gear"),
+      carb: asInteger (r . "carb")
     };
   }
 
diff --git a/libs/language-server/src/grammar/expression.langium b/libs/language-server/src/grammar/expression.langium
index aa490cf54..14261af25 100644
--- a/libs/language-server/src/grammar/expression.langium
+++ b/libs/language-server/src/grammar/expression.langium
@@ -22,7 +22,7 @@ ReplaceExpression infers Expression:
   second=BinaryExpression 'with' third=BinaryExpression)*;
 
 infix BinaryExpression on PrimaryExpression:
-  'cellInColumn' // Higher precedence
+  '.' // Higher precedence
   > 'pow' | 'root'
   > '*' | '/' | '%'
   > '+' | '-'
diff --git a/libs/language-server/src/lib/ast/expressions/evaluators/cell-in-column-operator-evaluator.ts b/libs/language-server/src/lib/ast/expressions/evaluators/dot-operator-evaluator.ts
similarity index 96%
rename from libs/language-server/src/lib/ast/expressions/evaluators/cell-in-column-operator-evaluator.ts
rename to libs/language-server/src/lib/ast/expressions/evaluators/dot-operator-evaluator.ts
index 237c687db..9c401191c 100644
--- a/libs/language-server/src/lib/ast/expressions/evaluators/cell-in-column-operator-evaluator.ts
+++ b/libs/language-server/src/lib/ast/expressions/evaluators/dot-operator-evaluator.ts
@@ -25,10 +25,10 @@ import {
   STRING_TYPEGUARD,
 } from '../typeguards';
 
-export class CellInColumnOperatorEvaluator
+export class DotOperatorEvaluator
   implements OperatorEvaluator<BinaryExpression>
 {
-  public readonly operator = 'cellInColumn' as const;
+  public readonly operator = '.' as const;
 
   evaluate(
     expression: BinaryExpression,
diff --git a/libs/language-server/src/lib/ast/expressions/operator-registry.ts b/libs/language-server/src/lib/ast/expressions/operator-registry.ts
index d541c18b6..ca6083acf 100644
--- a/libs/language-server/src/lib/ast/expressions/operator-registry.ts
+++ b/libs/language-server/src/lib/ast/expressions/operator-registry.ts
@@ -15,7 +15,7 @@ import {
 import { AdditionOperatorEvaluator } from './evaluators/addition-operator-evaluator';
 import { AndOperatorEvaluator } from './evaluators/and-operator-evaluator';
 import { CeilOperatorEvaluator } from './evaluators/ceil-operator-evaluator';
-import { CellInColumnOperatorEvaluator } from './evaluators/cell-in-column-operator-evaluator';
+import { DotOperatorEvaluator } from './evaluators/dot-operator-evaluator';
 import { DivisionOperatorEvaluator } from './evaluators/division-operator-evaluator';
 import { EqualityOperatorEvaluator } from './evaluators/equality-operator-evaluator';
 import { FloorOperatorEvaluator } from './evaluators/floor-operator-evaluator';
@@ -61,7 +61,7 @@ import {
   type UnaryExpressionOperator,
 } from './operator-types';
 import { BasicArithmeticOperatorTypeComputer } from './type-computers/basic-arithmetic-operator-type-computer';
-import { CellInColumnOperatorTypeComputer } from './type-computers/cell-in-column-operator-type-computer';
+import { DotOperatorTypeComputer } from './type-computers/dot-operator-type-computer';
 import { DivisionOperatorTypeComputer } from './type-computers/division-operator-type-computer';
 import { EqualityOperatorTypeComputer } from './type-computers/equality-operator-type-computer';
 import { ExponentialOperatorTypeComputer } from './type-computers/exponential-operator-type-computer';
@@ -119,7 +119,7 @@ export class DefaultOperatorEvaluatorRegistry
     lengthof: new LengthofOperatorEvaluator(),
   };
   binary = {
-    cellInColumn: new CellInColumnOperatorEvaluator(),
+    '.': new DotOperatorEvaluator(),
     pow: new PowOperatorEvaluator(),
     root: new RootOperatorEvaluator(),
     '*': new MultiplicationOperatorEvaluator(),
@@ -167,7 +167,7 @@ export class DefaultOperatorTypeComputerRegistry
     lengthof: new LengthofOperatorTypeComputer(this.valueTypeProvider),
   };
   binary = {
-    cellInColumn: new CellInColumnOperatorTypeComputer(this.valueTypeProvider),
+    '.': new DotOperatorTypeComputer(this.valueTypeProvider),
     pow: new ExponentialOperatorTypeComputer(this.valueTypeProvider),
     root: new ExponentialOperatorTypeComputer(this.valueTypeProvider),
     '*': new BasicArithmeticOperatorTypeComputer(this.valueTypeProvider),
diff --git a/libs/language-server/src/lib/ast/expressions/type-computers/cell-in-column-operator-type-computer.ts b/libs/language-server/src/lib/ast/expressions/type-computers/dot-operator-type-computer.ts
similarity index 84%
rename from libs/language-server/src/lib/ast/expressions/type-computers/cell-in-column-operator-type-computer.ts
rename to libs/language-server/src/lib/ast/expressions/type-computers/dot-operator-type-computer.ts
index 95408757b..ed55c61cd 100644
--- a/libs/language-server/src/lib/ast/expressions/type-computers/cell-in-column-operator-type-computer.ts
+++ b/libs/language-server/src/lib/ast/expressions/type-computers/dot-operator-type-computer.ts
@@ -7,13 +7,10 @@ import { type BinaryExpression } from '../../generated/ast';
 import {
   type ValueType,
   type ValueTypeProvider,
-  isCollectionValueType,
 } from '../../wrappers/value-type';
 import { type BinaryOperatorTypeComputer } from '../operator-type-computer';
 
-export class CellInColumnOperatorTypeComputer
-  implements BinaryOperatorTypeComputer
-{
+export class DotOperatorTypeComputer implements BinaryOperatorTypeComputer {
   constructor(protected readonly valueTypeProvider: ValueTypeProvider) {}
 
   computeType(
@@ -22,12 +19,7 @@ export class CellInColumnOperatorTypeComputer
     expression: BinaryExpression,
     context: ValidationContext | undefined,
   ): ValueType | undefined {
-    if (
-      !isCollectionValueType(
-        leftOperandType,
-        this.valueTypeProvider.Primitives.Text,
-      )
-    ) {
+    if (!leftOperandType.equals(this.valueTypeProvider.Primitives.SheetRow)) {
       context?.accept(
         'error',
         `Operator does not support type ${leftOperandType.getName()}`,
diff --git a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/collection/abstract-collection-value-type.ts b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/collection/abstract-collection-value-type.ts
index 468c38901..b4ea4d4b5 100644
--- a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/collection/abstract-collection-value-type.ts
+++ b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/collection/abstract-collection-value-type.ts
@@ -14,8 +14,4 @@ export abstract class AbstractCollectionValueType<
   override isAllowedAsRuntimeParameter(): boolean {
     return false;
   }
-
-  override isReferenceableByUser(): boolean {
-    return true;
-  }
 }
diff --git a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/index.ts b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/index.ts
index 103301814..65cf9e8b5 100644
--- a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/index.ts
+++ b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/index.ts
@@ -22,6 +22,7 @@ export { type TextValuetype } from './text-value-type';
 export { type TransformValuetype } from './transform-value-type';
 export { type ValuetypeAssignmentValuetype } from './value-type-assignment-value-type';
 export { type ValuetypeDefinitionValuetype } from './value-type-definition-value-type';
+export { type SheetRowValueType } from './sheetrow-value-type';
 
 export {
   ValueTypeProvider,
diff --git a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/primitive-value-type-provider.ts b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/primitive-value-type-provider.ts
index 3563b78a0..42a6ecdfb 100644
--- a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/primitive-value-type-provider.ts
+++ b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/primitive-value-type-provider.ts
@@ -16,6 +16,7 @@ import { type PrimitiveValueType } from './primitive-value-type';
 import { RegexValuetype } from './regex-value-type';
 import { TextValuetype } from './text-value-type';
 import { TransformValuetype } from './transform-value-type';
+import { SheetRowValueType } from './sheetrow-value-type';
 import { ValuetypeAssignmentValuetype } from './value-type-assignment-value-type';
 import { ValuetypeDefinitionValuetype } from './value-type-definition-value-type';
 
@@ -48,6 +49,8 @@ export class PrimitiveValueTypeProvider {
 
   Transform = new TransformValuetype();
 
+  SheetRow = new SheetRowValueType();
+
   getAll(): PrimitiveValueType[] {
     return [
       this.Boolean,
@@ -60,6 +63,7 @@ export class PrimitiveValueTypeProvider {
       this.ValuetypeAssignment,
       this.ValuetypeDefinition,
       this.Transform,
+      this.SheetRow,
     ];
   }
 }
diff --git a/libs/language-server/src/lib/ast/wrappers/value-type/primitive/sheetrow-value-type.ts b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/sheetrow-value-type.ts
new file mode 100644
index 000000000..84cdee0bf
--- /dev/null
+++ b/libs/language-server/src/lib/ast/wrappers/value-type/primitive/sheetrow-value-type.ts
@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: 2023 Friedrich-Alexander-Universitat Erlangen-Nurnberg
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { PrimitiveValueType } from './primitive-value-type';
+import { type ValueTypeVisitor } from '../value-type';
+import { type InternalValidValueRepresentation } from '../../../expressions';
+
+export class SheetRowValueType extends PrimitiveValueType<string[]> {
+  acceptVisitor<R>(visitor: ValueTypeVisitor<R>): R {
+    return visitor.visitSheetRow(this);
+  }
+
+  override isAllowedAsRuntimeParameter(): false {
+    return false;
+  }
+
+  override getName(): 'SheetRow' {
+    return 'SheetRow';
+  }
+
+  override isInternalValidValueRepresentation(
+    operandValue: InternalValidValueRepresentation,
+  ): operandValue is string[] {
+    return (
+      Array.isArray(operandValue) &&
+      operandValue.every((element) => typeof element === 'string')
+    );
+  }
+
+  override isReferenceableByUser(): true {
+    return true;
+  }
+}
diff --git a/libs/language-server/src/lib/ast/wrappers/value-type/value-type.ts b/libs/language-server/src/lib/ast/wrappers/value-type/value-type.ts
index dab5cf62a..bdd0f6908 100644
--- a/libs/language-server/src/lib/ast/wrappers/value-type/value-type.ts
+++ b/libs/language-server/src/lib/ast/wrappers/value-type/value-type.ts
@@ -20,6 +20,7 @@ import {
   type RegexValuetype,
   type TextValuetype,
   type TransformValuetype,
+  type SheetRowValueType,
   type ValuetypeAssignmentValuetype,
 } from './primitive';
 
@@ -93,4 +94,6 @@ export abstract class ValueTypeVisitor<R = unknown> {
   abstract visitTransform(valueType: TransformValuetype): R;
 
   abstract visitAtomicValueType(valueType: AtomicValueType): R;
+
+  abstract visitSheetRow(valueType: SheetRowValueType): R;
 }
diff --git a/libs/language-server/src/lib/validation/checks/transform-body.ts b/libs/language-server/src/lib/validation/checks/transform-body.ts
index d52eff947..21dcf0c1d 100644
--- a/libs/language-server/src/lib/validation/checks/transform-body.ts
+++ b/libs/language-server/src/lib/validation/checks/transform-body.ts
@@ -133,10 +133,6 @@ function checkInputForTableRowTransform(
     return;
   }
 
-  const textCollection = props.valueTypeProvider.createCollectionValueTypeOf(
-    props.valueTypeProvider.Primitives.Text,
-  );
-
   const input = onlyElementOrUndefined(inputs);
   const inputValueType = props.wrapperFactories.ValueType.wrap(
     input?.valueType,
@@ -154,10 +150,10 @@ function checkInputForTableRowTransform(
     return;
   }
 
-  if (!inputValueType.equals(textCollection)) {
+  if (!inputValueType.equals(props.valueTypeProvider.Primitives.SheetRow)) {
     props.validationContext.accept(
       'error',
-      'This input must be of type `Collection<text>',
+      'This input must be of type `SheetRow`',
       {
         node: input.valueType,
       },
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSAgencyInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSAgencyInterpreter.jv
index 7a9fafe83..fd3087efc 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSAgencyInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSAgencyInterpreter.jv
@@ -9,14 +9,14 @@ valuetype Agency {
   property agencyTimezone oftype text;
 }
 transform AgencyParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to agency oftype Agency;
 
   agency: {
-    agencyId: r cellInColumn "agency_id",
-    agencyName: r cellInColumn "agency_name",
-    agencyUrl: r cellInColumn "agency_url",
-    agencyTimezone: r cellInColumn "agency_timezone",
+    agencyId: r . "agency_id",
+    agencyName: r . "agency_name",
+    agencyUrl: r . "agency_url",
+    agencyTimezone: r . "agency_timezone",
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarDatesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarDatesInterpreter.jv
index d1b10a125..8d79f9764 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarDatesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarDatesInterpreter.jv
@@ -9,13 +9,13 @@ valuetype CalendarDates {
                                                   // 2 - Service has been removed for the specified date.
 }
 transform CalendarDatesParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to dates oftype CalendarDates;
 
   dates: {
-    serviceId: r cellInColumn "service_id",
-    date: r cellInColumn "date",
-    exceptionType: r cellInColumn "exception_type",
+    serviceId: r . "service_id",
+    date: r . "date",
+    exceptionType: r . "exception_type",
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarInterpreter.jv
index 29614539f..e072ce00c 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSCalendarInterpreter.jv
@@ -16,20 +16,20 @@ valuetype Calendar {
   property endDate oftype GTFSDate;
 }
 transform CalendarParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to calendar oftype Calendar;
 
   calendar: {
-    serviceId: r cellInColumn 0,
-    monday: r cellInColumn 1,
-    tuesday: r cellInColumn 2,
-    wednesday: r cellInColumn 3,
-    thursday: r cellInColumn 4,
-    friday: r cellInColumn 5,
-    saturday: r cellInColumn 6,
-    sunday: r cellInColumn 7,
-    startDate: r cellInColumn 8,
-    endDate: r cellInColumn 9,
+    serviceId: r . 0,
+    monday: r . 1,
+    tuesday: r . 2,
+    wednesday: r . 3,
+    thursday: r . 4,
+    friday: r . 5,
+    saturday: r . 6,
+    sunday: r . 7,
+    startDate: r . 8,
+    endDate: r . 9,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSFareAttributesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSFareAttributesInterpreter.jv
index 7b8f0d995..c569dfea9 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSFareAttributesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSFareAttributesInterpreter.jv
@@ -12,16 +12,16 @@ valuetype FareAttributes {
   property transferDuration oftype text;
 }
 transform FareAttributesParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to fareAttributes oftype FareAttributes;
 
   fareAttributes: {
-    fareId: r cellInColumn 0,
-    price: r cellInColumn 1,
-    currencyType: r cellInColumn 2,
-    paymentMethod: r cellInColumn 3,
-    transfers: r cellInColumn 4,
-    transferDuration: r cellInColumn 5,
+    fareId: r . 0,
+    price: r . 1,
+    currencyType: r . 2,
+    paymentMethod: r . 3,
+    transfers: r . 4,
+    transferDuration: r . 5,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSFareRulesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSFareRulesInterpreter.jv
index 3f7c3af98..03b2c6184 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSFareRulesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSFareRulesInterpreter.jv
@@ -10,15 +10,15 @@ valuetype FareRules {
   property containsId oftype text;
 }
 transform FareRulesParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to fareRules oftype FareRules;
 
   fareRules: {
-    fareId: r cellInColumn 0,
-    routeId: r cellInColumn 1,
-    originId: r cellInColumn 2,
-    destinationId: r cellInColumn 3,
-    containsId: r cellInColumn 4,
+    fareId: r . 0,
+    routeId: r . 1,
+    originId: r . 2,
+    destinationId: r . 3,
+    containsId: r . 4,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSFrequenciesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSFrequenciesInterpreter.jv
index d12e6c087..5e767c543 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSFrequenciesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSFrequenciesInterpreter.jv
@@ -9,14 +9,14 @@ valuetype Frequencies {
   property headwaySecs oftype GTFSNonNegativeInteger;
 }
 transform FrequenciesParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to frequencies oftype Frequencies;
 
   frequencies: {
-    tripId: r cellInColumn 0,
-    startTime: r cellInColumn 1,
-    endTime: r cellInColumn 2,
-    headwaySecs: r cellInColumn 3,
+    tripId: r . 0,
+    startTime: r . 1,
+    endTime: r . 2,
+    headwaySecs: r . 3,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSRoutesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSRoutesInterpreter.jv
index 2d5a6b187..2b2a43525 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSRoutesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSRoutesInterpreter.jv
@@ -14,19 +14,19 @@ valuetype Route {
   property routeTextColor oftype text;
 }
 transform RouteParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to route oftype Route;
 
   route: {
-    routeId: r cellInColumn 0,
-    agencyId: r cellInColumn 1,
-    routeShortName: r cellInColumn 2,
-    routeLongName: r cellInColumn 3,
-    routeDesc: r cellInColumn 4,
-    routeType: r cellInColumn 5,
-    routeUrl: r cellInColumn 6,
-    routeColor: r cellInColumn 7,
-    routeTextColor: r cellInColumn 8,
+    routeId: r . 0,
+    agencyId: r . 1,
+    routeShortName: r . 2,
+    routeLongName: r . 3,
+    routeDesc: r . 4,
+    routeType: r . 5,
+    routeUrl: r . 6,
+    routeColor: r . 7,
+    routeTextColor: r . 8,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSShapesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSShapesInterpreter.jv
index 2f0ce1e64..c3916a25b 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSShapesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSShapesInterpreter.jv
@@ -10,15 +10,15 @@ valuetype Shape {
   property shapeDistTraveled oftype text;
 }
 transform ShapeParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to shape oftype Shape;
 
   shape: {
-    shapeId: r cellInColumn 0,
-    shapePtLat: r cellInColumn 1,
-    shapePtLon: r cellInColumn 2,
-    shapePtSequence: r cellInColumn 3,
-    shapeDistTraveled: r cellInColumn 4,
+    shapeId: r . 0,
+    shapePtLat: r . 1,
+    shapePtLon: r . 2,
+    shapePtSequence: r . 3,
+    shapeDistTraveled: r . 4,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSStopTimesInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSStopTimesInterpreter.jv
index a0e894cad..33b8cae3c 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSStopTimesInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSStopTimesInterpreter.jv
@@ -14,19 +14,19 @@ valuetype StopTime {
   property shapeDistTraveled oftype text;
 }
 transform StopTimeParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to stopTime oftype StopTime;
 
   stopTime: {
-    tripId: r cellInColumn 0,
-    arrivalId: r cellInColumn 1,
-    departureTime: r cellInColumn 2,
-    stopId: r cellInColumn 3,
-    stopSequence: r cellInColumn 4,
-    stopHeadsign: r cellInColumn 5,
-    pickupType: r cellInColumn 6,
-    dropOffTime: r cellInColumn 7,
-    shapeDistTraveled: r cellInColumn 8,
+    tripId: r . 0,
+    arrivalId: r . 1,
+    departureTime: r . 2,
+    stopId: r . 3,
+    stopSequence: r . 4,
+    stopHeadsign: r . 5,
+    pickupType: r . 6,
+    dropOffTime: r . 7,
+    shapeDistTraveled: r . 8,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSStopsInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSStopsInterpreter.jv
index ec37aa87f..58cb5a0b5 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSStopsInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSStopsInterpreter.jv
@@ -12,17 +12,17 @@ valuetype Stop {
   property stopUrl oftype text;
 }
 transform StopParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to stop oftype Stop;
 
   stop: {
-    stopId: r cellInColumn 0,
-    stopName: r cellInColumn 1,
-    stopDesc: r cellInColumn 2,
-    stopLat: r cellInColumn 3,
-    stopLon: r cellInColumn 4,
-    zoneId: r cellInColumn 5,
-    stopUrl: r cellInColumn 6,
+    stopId: r . 0,
+    stopName: r . 1,
+    stopDesc: r . 2,
+    stopLat: r . 3,
+    stopLon: r . 4,
+    zoneId: r . 5,
+    stopUrl: r . 6,
   };
 }
 
diff --git a/libs/language-server/src/stdlib/domain/mobility/GTFSTripsInterpreter.jv b/libs/language-server/src/stdlib/domain/mobility/GTFSTripsInterpreter.jv
index 549a12b27..62018c9b9 100644
--- a/libs/language-server/src/stdlib/domain/mobility/GTFSTripsInterpreter.jv
+++ b/libs/language-server/src/stdlib/domain/mobility/GTFSTripsInterpreter.jv
@@ -12,17 +12,17 @@ valuetype Trip {
   property shapeId oftype text;
 }
 transform TripParser {
-  from r oftype Collection<text>;
+  from r oftype SheetRow;
   to trip oftype Trip;
 
   trip: {
-    routeId: r cellInColumn 0,
-    serviceId: r cellInColumn 1,
-    tripId: r cellInColumn 2,
-    tripHeadsign: r cellInColumn 3,
-    directionId: r cellInColumn 4,
-    blockId: r cellInColumn 5,
-    shapeId: r cellInColumn 6,
+    routeId: r . 0,
+    serviceId: r . 1,
+    tripId: r . 2,
+    tripHeadsign: r . 3,
+    directionId: r . 4,
+    blockId: r . 5,
+    shapeId: r . 6,
   };
 }