diff --git a/docs/reference/schema.md b/docs/reference/schema.md
index 9100315..507ef60 100644
--- a/docs/reference/schema.md
+++ b/docs/reference/schema.md
@@ -351,6 +351,8 @@ This component is referenced by the following properties:
 - [`Span/supplier`](network-schema.json,/$defs/Span,supplier)
 - [`Phase/funders`](network-schema.json,/$defs/Phase,funders)
 
+Additional properties are not permitted within `OrganisationReference` objects.
+
 Each `OrganisationReference` has the following fields:
 
 ::::{tab-set}
@@ -421,6 +423,8 @@ This component is referenced by the following properties:
 - [`Span/phase`](network-schema.json,/$defs/Span,phase)
 - [`Contract/relatedPhases`](network-schema.json,/$defs/Contract,relatedPhases)
 
+Additional properties are not permitted within `PhaseReference` objects.
+
 Each `PhaseReference` has the following fields:
 
 ::::{tab-set}
diff --git a/examples/csv/nodes.csv b/examples/csv/nodes.csv
index 3e4c551..0e339ed 100644
--- a/examples/csv/nodes.csv
+++ b/examples/csv/nodes.csv
@@ -1,3 +1,3 @@
-id,nodes/0/id,nodes/0/name,nodes/0/phase/id,nodes/0/phase/name,nodes/0/status,nodes/0/location,nodes/0/address/streetAddress,nodes/0/address/locality,nodes/0/address/region,nodes/0/address/postalCode,nodes/0/address/country,nodes/0/type,nodes/0/accessPoint,nodes/0/power,nodes/0/technologies,nodes/0/physicalInfrastructureProvider/id,nodes/0/physicalInfrastructureProvider/name
-a096d627-72e1-4f9b-b129-951b1737bff4,1,Accra,1,NextGen Phase 1,operational,POINT (-0.174 5.625),Boundary Rd,Shiashie,Accra,12345,GH,pop,True,True,ip,GH-RGD-CS111111111,FibreCo
-a096d627-72e1-4f9b-b129-951b1737bff4,2,Kumasi,1,NextGen Phase 1,operational,POINT (-1.628 6.711),Kejetia Road,Bantama,Kumasi,00000,GH,pop,False,True,ip,GH-RGD-CS111111111,FibreCo
+id,nodes/0/id,nodes/0/name,nodes/0/phase/id,nodes/0/phase/name,nodes/0/status,nodes/0/location,nodes/0/address/streetAddress,nodes/0/address/locality,nodes/0/address/region,nodes/0/address/postalCode,nodes/0/address/country,nodes/0/type,nodes/0/accessPoint,nodes/0/power,nodes/0/technologies,nodes/0/physicalInfrastructureProvider/id,nodes/0/physicalInfrastructureProvider/name,nodes/0/location/type,nodes/0/location/coordinates
+a096d627-72e1-4f9b-b129-951b1737bff4,1,Accra,1,NextGen Phase 1,operational,,Boundary Rd,Shiashie,Accra,12345,GH,pop,True,True,ip,GH-RGD-CS111111111,FibreCo,Point,-0.174;5.625
+a096d627-72e1-4f9b-b129-951b1737bff4,2,Kumasi,1,NextGen Phase 1,operational,,Kejetia Road,Bantama,Kumasi,00000,GH,pop,False,True,ip,GH-RGD-CS111111111,FibreCo,Point,-1.628;6.711
diff --git a/examples/csv/spans.csv b/examples/csv/spans.csv
index 775199f..1526e21 100644
--- a/examples/csv/spans.csv
+++ b/examples/csv/spans.csv
@@ -1,2 +1,2 @@
-id,spans/0/id,spans/0/name,spans/0/phase/id,spans/0/phase/name,spans/0/status,spans/0/readyForServiceDate,spans/0/start,spans/0/end,spans/0/directed,spans/0/route,spans/0/physicalInfrastructureProvider/id,spans/0/physicalInfrastructureProvider/name,spans/0/supplier/id,spans/0/supplier/name,spans/0/transmissionMedium,spans/0/deployment,spans/0/deploymentDetails/description,spans/0/darkFibre,spans/0/fibreType,spans/0/fibreTypeDetails/fibreSubtype,spans/0/fibreTypeDetails/description,spans/0/fibreCount,spans/0/fibreLength,spans/0/technologies,spans/0/capacity,spans/0/capacityDetails/description,spans/0/countries
-a096d627-72e1-4f9b-b129-951b1737bff4,1,Accra to Kumasi,1,NextGen Phase 1,operational,2018-01-01,1,2,False,"LINESTRING (-0.173 5.626, -0.178 5.807, -0.112 5.971, -0.211 5.963, -0.321 6.17, -0.488 6.29, -0.56 6.421, -0.752 6.533, -0.867 6.607, -1.101 6.585, -1.304 6.623, -1.461 6.727, -1.628 6.713)",GH-RGD-CS111111111,FibreCo,GH-RGD-CS333333333,ProjectCo,fibre,belowGround,Buried in ducts,True,G.652,G.652.D,"CABLED STANDARD ENHANCED SINGLEMODE FIBRE ESMF, LOW WATER PEAK SINGLE MODE FIBRE G.652.D, OS2",24,276000,sdh,4.976,2xSTM-16,GH
+id,spans/0/id,spans/0/name,spans/0/phase/id,spans/0/phase/name,spans/0/status,spans/0/readyForServiceDate,spans/0/start,spans/0/end,spans/0/directed,spans/0/route,spans/0/physicalInfrastructureProvider/id,spans/0/physicalInfrastructureProvider/name,spans/0/supplier/id,spans/0/supplier/name,spans/0/transmissionMedium,spans/0/deployment,spans/0/deploymentDetails/description,spans/0/darkFibre,spans/0/fibreType,spans/0/fibreTypeDetails/fibreSubtype,spans/0/fibreTypeDetails/description,spans/0/fibreCount,spans/0/fibreLength,spans/0/technologies,spans/0/capacity,spans/0/capacityDetails/description,spans/0/countries,spans/0/route/type,spans/0/route/coordinates
+a096d627-72e1-4f9b-b129-951b1737bff4,1,Accra to Kumasi,1,NextGen Phase 1,operational,2018-01-01,1,2,False,,GH-RGD-CS111111111,FibreCo,GH-RGD-CS333333333,ProjectCo,fibre,belowGround,Buried in ducts,True,G.652,G.652.D,"CABLED STANDARD ENHANCED SINGLEMODE FIBRE ESMF, LOW WATER PEAK SINGLE MODE FIBRE G.652.D, OS2",24,276000,sdh,4.976,2xSTM-16,GH,LineString,"-0.173,5.626;-0.178,5.807;-0.112,5.971;-0.211,5.963;-0.321,6.17;-0.488,6.29;-0.56,6.421;-0.752,6.533;-0.867,6.607;-1.101,6.585;-1.304,6.623;-1.461,6.727;-1.628,6.713"
diff --git a/schema/network-schema.json b/schema/network-schema.json
index 9ee1eb9..b296e19 100644
--- a/schema/network-schema.json
+++ b/schema/network-schema.json
@@ -280,7 +280,10 @@
       "required": [
         "id"
       ],
-      "minProperties": 1
+      "minProperties": 1,
+      "propertyNames": {
+        "pattern": "^(?!(network$))"
+      }
     },
     "Span": {
       "title": "Span",
@@ -751,7 +754,10 @@
       "required": [
         "id"
       ],
-      "minProperties": 1
+      "minProperties": 1,
+      "propertyNames": {
+        "pattern": "^(?!(network$))"
+      }
     },
     "Phase": {
       "title": "Phase",
@@ -1241,7 +1247,8 @@
       "required": [
         "id"
       ],
-      "minProperties": 1
+      "minProperties": 1,
+      "additionalProperties": false
     },
     "PhaseReference": {
       "title": "Phase reference",
@@ -1264,7 +1271,8 @@
       "required": [
         "id"
       ],
-      "minProperties": 1
+      "minProperties": 1,
+      "additionalProperties": false
     },
     "Address": {
       "title": "Address",