GitHub user dosubot[bot] added a comment to the discussion: 关于电网拓扑数据导入
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不需要为 LineSegment2LineSegment 这种同类型顶点之间的连接正反各写一遍边标签，只需定义一次 edgeLabel（比如
schema.edgeLabel("LineSegment2LineSegment")），即可支持 LineSegment → LineSegment
的边。HugeGraph 的边是有向的，A→B 和 B→A 是两条独立的边，想实现双向连接，只需在数据导入时生成两条边（A→B 和 B→A），都用同一个
edgeLabel 导入即可，无需再定义反向 edgeLabel。
比如：
```groovy
schema.edgeLabel("LineSegment2LineSegment")
.sourceLabel("LineSegment")
.targetLabel("LineSegment")
.properties()
.ifNotExist().create();
```
导入时，edge 数据里有 A→B 和 B→A 两条记录即可：
| from | to |
|------|-----|
| A | B |
| B | A |
这样查询时可以通过 direction 参数（OUT/IN/BOTH）获取正向、反向或双向的边，底层存储和 schema
仍然是有向的。[源码说明](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/EdgeLabel.java)
只有在你需要区分正向和反向的语义（比如属性不同），才需要定义两个不同的 edgeLabel，否则只需一个
edgeLabel，数据里导入正反两条边即可。[详细机制](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeEdge.java)
如需具体 struct.json 或数据处理脚本示例可以继续补充需求。
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