# transforms.api.FoundryOutputParam

## *class* transforms.api.FoundryOutputParam(aliases, type='foundry', description=None, properties=None) {#transforms.api.FoundryOutputParam}

A base class for transforms output parameters. Not intended for direct use. See [`transforms.api.Output`](../api-output/index.md#transforms.api.Output) for an example of concrete usage.

All aliases are resolved and added in the output specs section of JobSpec. Will not pass a `defaultPath` to the graph dependency if the alias is a valid resource identifier (RID).

* **Parameters:**
  * **aliases** ([*list* ↗](https://docs.python.org/3/library/stdtypes.html#list) *of* [*str* ↗](https://docs.python.org/3/library/stdtypes.html#str)) – A list of absolute Compass paths or dataset RIDs.
  * **description** ([*str* ↗](https://docs.python.org/3/library/stdtypes.html#str) *,* *optional*) – Parameter description.
  * **properties** ([*dict* ↗](https://docs.python.org/3/library/stdtypes.html#dict) *,* *optional*) – Optional properties that get written to the build graph output reference.
  * **type** ([*str* ↗](https://docs.python.org/3/library/stdtypes.html#str) *,* *optional*) – The output dataset type.

### *static* instance(context, json\_value) {#transforms.api.FoundryOutputParam.instance}

Creates a parameter instance using the raw JSON value from JobSpec parameters and specific context.

The return value is injected in the transform compute function.

* **Parameters:**
  * **context** ([*ParamContext*](../api-paramcontext/index.md#transforms.api.ParamContext)) – A context object with properties that might be required for creating an instance.
  * **json\_value** (*any*) – Any raw value deserialized from JobSpec parameters.

#### History

* Added in version 1.53.0.

### *property* json\_value {#transforms.api.FoundryOutputParam.json\_value}

Returns the JSON value for this parameter to put in JobSpec.

If the return value is `None`, the parameter is considered unbound. If any transform’s parameter is unbound, the transform is considered to be unbound. For unbound transforms, the JobSpec is not published.

### output\_results(\_instance, \*\*\_kwargs) {#transforms.api.FoundryOutputParam.output\_results}

Generates a map from output RIDs to `TransformsOutputResult`. Results are merged into a `TransformJobResult`.

* **Parameters:**
  **instance** – An object of the type generated by `instance()`.

### *property* schema {#transforms.api.FoundryOutputParam.schema}

Returns JSON schema for parameters of this type. Must return a valid JSON schema.