# Page Not Found

The URL `guardian/guardian/standard-registry/schemas/system-schema-apis/returns-schema-by-username` does not exist.

You might be looking for one of these pages:
- [Returns Schema by Username](https://guardian.hedera.com/guardian/standard-registry/schemas/system-schema-apis/returns-schema-by-username.md)
- [Returns Schema by Type](https://guardian.hedera.com/guardian/standard-registry/schemas/system-schema-apis/returns-schema-by-type.md)
- [Returns Map API Key](https://guardian.hedera.com/guardian/standard-registry/schemas/system-schema-apis/returns-map-api-key.md)
- [Schema Type](https://guardian.hedera.com/guardian/standard-registry/schemas/system-schema-apis/schema-type.md)
- [API for Returning Schema Tree](https://guardian.hedera.com/guardian/standard-registry/schemas/schema-tree/returning-schema-tree.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://guardian.hedera.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://guardian.hedera.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/guardian/standard-registry/schemas/system-schema-apis/returns-schema-by-username.md`)
- Use `Accept: text/markdown` header for content negotiation