{
  "dataset": {
    "title_zh": "面向BIM运维的暖通空调系统拓扑-空间图数据集",
    "title_en": "HVAC Topology-Spatial Graph Dataset for BIM-Based Operation and Maintenance",
    "version": "1.0.0",
    "release_date": "2026-04-29",
    "license": "CC-BY-NC-4.0",
    "public_fragment_count": 406,
    "public_node_count": 363683,
    "public_edge_count": 359086
  },
  "file_structure": {
    "nodes": "nodes/{public_id}_nodes.json",
    "edges": "edges/{public_id}_edges.json",
    "public_file_index": "public_file_index.csv",
    "statistics": "dataset_statistics.csv"
  },
  "node_schema": {
    "id": {
      "type": "integer",
      "description": "Anonymized node identifier. IDs are local to each public subgraph and start from 10000."
    },
    "category": {
      "type": "string",
      "description": "HVAC component category.",
      "allowed_values": [
        "机械设备",
        "管件",
        "管道",
        "管道附件",
        "软风管",
        "风管",
        "风管管件",
        "风管附件",
        "风道末端"
      ]
    },
    "type": {
      "type": "string",
      "description": "Component type retained after anonymization."
    },
    "mepSystem": {
      "type": "array[string]",
      "description": "MEP system labels associated with the component."
    },
    "position": {
      "type": "array[number]",
      "length": 3,
      "description": "Local anonymized XYZ coordinate. It is not an absolute building coordinate."
    },
    "extend": {
      "type": "array[number]",
      "length": 3,
      "description": "Approximate component spatial extent in local coordinate space."
    },
    "rotation": {
      "type": "array[number]",
      "length": 3,
      "description": "Component rotation attributes retained after anonymization."
    }
  },
  "edge_schema": {
    "source": {
      "type": "integer",
      "description": "Source node ID in the same public subgraph file."
    },
    "target": {
      "type": "integer",
      "description": "Target node ID in the same public subgraph file."
    },
    "connectType": {
      "type": "string",
      "description": "Connection type, e.g., End."
    }
  },
  "statistics_schema": {
    "public_id": "Public subgraph identifier.",
    "node_count": "Number of nodes in the public subgraph.",
    "edge_count": "Number of edges in the public subgraph.",
    "is_connected": "Whether the public file is a single connected graph.",
    "component_count": "Number of connected components in the public file.",
    "largest_component_node_count": "Node count of the largest connected component.",
    "largest_component_node_ratio": "Largest component node count divided by node count.",
    "isolated_node_count": "Number of degree-zero nodes.",
    "category_distribution": "Component category distribution.",
    "min_x": "Minimum local X coordinate.",
    "min_y": "Minimum local Y coordinate.",
    "min_z": "Minimum local Z coordinate.",
    "max_x": "Maximum local X coordinate.",
    "max_y": "Maximum local Y coordinate.",
    "max_z": "Maximum local Z coordinate.",
    "avg_edge_length": "Average Euclidean edge length in local coordinates.",
    "max_edge_length": "Maximum Euclidean edge length in local coordinates.",
    "p95_edge_length": "95th percentile Euclidean edge length in local coordinates."
  },
  "anonymization": {
    "public_ids_shuffled": true,
    "node_ids_reindexed_per_subgraph": true,
    "node_id_start": 10000,
    "removed_sensitive_fields": [
      "elementId",
      "original element id",
      "original file name",
      "source model grouping",
      "reversible coordinate transformation parameters"
    ],
    "coordinate_mode": "local anonymized coordinate per public subgraph",
    "notes": "Public files may contain multiple connected components because smaller topology fragments were grouped or spatially repartitioned for privacy and release granularity."
  }
}