GitHub user dosubot[bot] edited a comment on the discussion: 关于电网拓扑数据导入
<!-- Answer -->
你只需要在 schema.groovy 里加上这两行即可解决 “属性键'source_label'不存在” 的报错：
```groovy
schema.propertyKey("source_label").asText().ifNotExist().create();
schema.propertyKey("target_label").asText().ifNotExist().create();
```
建议把这两行放在所有 propertyKey 定义的部分（和 id、name 等属性一起）。这样 loader 才能识别 struct.json 和
edge_connected_to.csv 里的 source_label、target_label 字段。
如果你希望把 source_label 和 target_label 作为边的属性存储（可选），可以在相关 edgeLabel 的 .properties()
里加上这两个属性，比如：
```groovy
schema.edgeLabel("LineSegment2StationHouse")
.sourceLabel("LineSegment")
.targetLabel("StationHouse")
.properties("source_label", "target_label")
.ifNotExist().create();
```
注意事项：
- edge_connected_to.csv 的 source_label/target_label 列内容必须和 schema.groovy 里顶点
label 完全一致（区分大小写），比如 LineSegment、StationHouse、LineSwitch、Substation。
- struct.json 的 value_mapping 要是平铺结构，不要嵌套在 label 下面，应该是：
```json
"value_mapping": {
"label": { "CONNECTED_TO": "LineSegment2StationHouse" },
"source_label": { "LineSegment": "LineSegment" },
"target_label": { "StationHouse": "StationHouse" }
}
```
- 修改 schema 后，重新执行 schema 创建和数据导入流程。
官方文档有详细说明：[schema.propertyKey
定义示例](https://github.com/apache/incubator-hugegraph-doc/blob/3e1c610281c91ea3a5c600b393088e9ffae34799/content/en/docs/quickstart/toolchain/hugegraph-loader.md#L897-L1100)
如还有问题，可以贴出 struct.json、schema.groovy 和 edge_connected_to.csv 的片段，我可以帮你逐条检查。
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GitHub link:
https://github.com/apache/hugegraph/discussions/2917#discussioncomment-15204714
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