# Static Schema Mapping
##  Static Schema Mapping
### Description
The Schema Mapping transform maps fields from an incoming stream over a specified Schema Definition. The result of this transform is an output stream that conforms to the mapped Schema Definition.
| Hop Engine | ✓ |
| ---------- | ------------ |
| Spark | ? |
| Flink | ? |
| Dataflow | ? |
Schema mapping is a useful mapping transform to precede transforms like [Text File Output](/data-shaper-1.21/knowing-the-data-shaper-designer/pipelines/transforms/textfileoutput.md) or [Excel Writer](/data-shaper-1.21/knowing-the-data-shaper-designer/pipelines/transforms/excelwriter.md) when we decide to refer to a [Schema Definition](/data-shaper-1.21/knowing-the-data-shaper-designer/index-2/static-schema-definition.md) to map the output layout of the file. By preceding these transforms with the Schema Mapping, the incoming stream will be already setup according to the expected output layout definition.
### Options
| Option | Description |
| ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Schema Definition | Name of the [Schema Definition](/data-shaper-1.21/knowing-the-data-shaper-designer/index-2/static-schema-definition.md) that we are going to map to the incoming stream. |
| Schema Fields | The set of schema fields that are mapped to stream fields. |
| Stream Fields name | The set of stream fields that are mapped to schema fields. |
* Use *Get fields* button to fill in the available fields from the incoming stream.
* Use the *Mapping* button to show a Mapping Dialog that will support the mapping process between the stream’s fields and the schema fields.
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