Add proper spec files

specs/data/migration/golden_gltf/Composite/Composite/composite.gltf

@@ -0,0 +1,299 @@
+{
+  "asset": {
+    "generator": "glTF-Transform v3.10.0",
+    "version": "2.0"
+  },
+  "accessors": [
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+      "bufferView": 0,
+      "byteOffset": 0
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+    {
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+      "bufferView": 0,
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+    {
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+      "bufferView": 0,
+      "byteOffset": 700
+    },
+    {
+      "type": "SCALAR",
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+      "count": 25,
+      "bufferView": 0,
+      "byteOffset": 1000
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+    {
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+      "max": [
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+      "bufferView": 1,
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+    {
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+      "bufferView": 1,
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+    },
+    {
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+    {
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+      "bufferView": 3,
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+    {
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+      "bufferView": 3,
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+  "bufferViews": [
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+      "byteLength": 576,
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+      "target": 34962
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+      "target": 34963
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+    {
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+      "byteLength": 25
+    }
+  ],
+  "buffers": [
+    {
+      "name": "buffer",
+      "byteLength": 9165
+    }
+  ],
+  "materials": [
+    {
+      "pbrMetallicRoughness": {
+        "metallicFactor": 0
+      }
+    },
+    {
+      "pbrMetallicRoughness": {
+        "metallicFactor": 0
+      }
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
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+          "attributes": {
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+            "NORMAL": 5,
+            "_FEATURE_ID_0": 6
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+          "mode": 4,
+          "material": 0,
+          "indices": 9,
+          "extensions": {
+            "EXT_mesh_features": {
+              "featureIds": [
+                {
+                  "featureCount": 10,
+                  "attribute": 0,
+                  "propertyTable": -1
+                }
+              ]
+            }
+          }
+        }
+      ]
+    },
+    {
+      "primitives": [
+        {
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+            "NORMAL": 8
+          },
+          "mode": 4,
+          "material": 1,
+          "indices": 10
+        }
+      ]
+    }
+  ],
+  "nodes": [
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+        0,
+        0,
+        0.7071067811865476
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+    {
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+        4736313.0423059845
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+      "children": [
+        0
+      ]
+    },
+    {
+      "mesh": 1,
+      "extensions": {
+        "EXT_mesh_gpu_instancing": {
+          "attributes": {
+            "TRANSLATION": 0,
+            "ROTATION": 1,
+            "SCALE": 2,
+            "_FEATURE_ID_0": 3
+          }
+        },
+        "EXT_instance_features": {
+          "featureIds": [
+            {
+              "featureCount": 25,
+              "attribute": 0,
+              "propertyTable": 0
+            }
+          ]
+        }
+      }
+    },
+    {
+      "translation": [
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+        4081608.45,
+        4736316.76
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+      "children": [
+        2
+      ]
+    }
+  ],
+  "scenes": [
+    {
+      "nodes": [
+        1,
+        3
+      ]
+    }
+  ],
+  "scene": 0,
+  "extensionsUsed": [
+    "EXT_structural_metadata",
+    "EXT_mesh_features",
+    "EXT_mesh_gpu_instancing",
+    "EXT_instance_features"
+  ],
+  "extensionsRequired": [
+    "EXT_mesh_gpu_instancing"
+  ],
+  "extensions": {
+    "EXT_structural_metadata": {
+      "schema": {
+        "id": "ID_batch_table",
+        "name": "Generated from batch_table",
+        "classes": {
+          "class_batch_table": {
+            "name": "Generated from batch_table",
+            "properties": {
+              "Height": {
+                "name": "Height",
+                "description": "Generated from Height",
+                "type": "SCALAR",
+                "componentType": "UINT8",
+                "required": true
+              }
+            }
+          }
+        }
+      },
+      "propertyTables": [
+        {
+          "class": "class_batch_table",
+          "count": 25,
+          "properties": {
+            "Height": {
+              "values": 4
+            }
+          }
+        }
+      ]
+    }
+  }
+}