# Page Not Found

The URL `chapter-2-foundational-technology/data-sets-and-how-they-work` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Data Sets and How They Work](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/data-sets-and-how-they-work.md)
- [Brief Introduction to z/OS](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/brief-introduction-to-z-os.md)
- [Get Ready: Talk Like a Mainframer](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/get-ready-talk-like-a-mainframer.md)
- [Programming languages for Mainframe](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/programming-languages-for-mainframe.md)
- [Enterprise Storage 101](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/enterprise-storage-101.md)

## How to find the correct page

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### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/data-sets-and-how-they-work.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.

### Option 2 — Browse the documentation index

Full index: https://open-mainframe-project.gitbook.io/mainframe-open-education-project/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://open-mainframe-project.gitbook.io/mainframe-open-education-project/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/data-sets-and-how-they-work.md`).

You may also use `Accept: text/markdown` header for content negotiation.