同一个微服务不同shema文件的模型是否可以互相引用

1、在schema schema-a 文件中定义如下模型
```
GpcsRet:
type: "object"
properties:
code:
type: "integer"
description: "返回码"
msg:
type: "string"
description: "返回描述"
```

2、是否可以在schema B 文件中如下引用
```
CommonRsp:
type: "object"
properties:
ret:
$ref: "schema-a.yaml#/definitions/GpcsRet"
````

Start by locating how schema-a.yaml and schema B are loaded and how the $ref to definitions/GpcsRet is resolved. Trace the GpcsRet and CommonRsp definitions and check whether the project has an existing validation or schema-loading test for cross-file references. Done means documenting a supported or unsupported answer and any required constraints.

Written by the indexing model from the issue text.