# Directory: data-source-post-processing

The **optional** directory `data-source-post-processing` contains custom XSLT files.

See: [Directory: data-source-post-processing](/open-endpoints/configuration/data-source-transformation/data-source-post-processing.md).

## Transformation Input

The root tag of the input xml (which is automatically provided by the software) is `<data-source-post-processing-input>`. Within that root tag OpenEndpoints will insert the data converted from the data-source-definition or - if applicable - the output from a previous data-source-post-processing step.

![directory data sources post processing input](https://cdn.openendpoints.io/images/gitbook/directory-data-sources-post-processing-transformation-input.png)

## Transformation Output

The root tag of the output (=the file that is generated by your XSLT) must be `<data-source-post-processing-output>`.

![directory data sources post processing output](https://cdn.openendpoints.io/images/gitbook/directory-data-sources-post-processing-transformation-output.png)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://onestopconcept.gitbook.io/open-endpoints/configuration/application-directory-structure/directory-data-source-post-processing.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.