# Page Not Found

The URL `files/xLZ5qFzyd5Khl9Zl4wfI` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [How to Define Key Nodes & Evaluation Functions](https://webcanvas.gitbook.io/webcanvas-docs/2.-annotation/how-to-define-key-nodes-and-evaluation-functions.md)
- [Introduction of Evaluation Functions](https://webcanvas.gitbook.io/webcanvas-docs/2.-annotation/introduction-of-evaluation-functions.md)
- [3. Evaluation](https://webcanvas.gitbook.io/webcanvas-docs/3.-evaluation.md)
- [1. Get Started](https://webcanvas.gitbook.io/webcanvas-docs/1.-get-started.md)
- [2. Annotation](https://webcanvas.gitbook.io/webcanvas-docs/2.-annotation.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

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

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

```
GET https://webcanvas.gitbook.io/webcanvas-docs/2.-annotation/how-to-define-key-nodes-and-evaluation-functions.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://webcanvas.gitbook.io/webcanvas-docs/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://webcanvas.gitbook.io/webcanvas-docs/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., `/webcanvas-docs/2.-annotation/how-to-define-key-nodes-and-evaluation-functions.md`).

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