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update spec

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Leon van Kammen 2024-04-25 19:25:42 +00:00
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doc/RFC_XR_Fragments.md
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@ -1036,7 +1036,7 @@ The following demonstrates a simple video player:
# Additional scene metadata
XR Fragments does not aim to redefine the metadata-space by introducing its own cataloging-metadata fields.
XR Fragments does not aim to redefine the metadata-space or accessibility-space by introducing its own cataloging-metadata fields.
Instead, it encourages browsers to scan nodes for the following custom properties:
* [SPDX](https://spdx.dev/) license information
@ -1069,6 +1069,29 @@ There's no silver bullet when it comes to metadata, so one should support where
> These attributes can be scanned and presented during an `href` or `src` eye/mouse-over.
# Accessibility interface
The addressibility of XR Fragments allows for unique 3D-to-text transcripts, as well as an textual interface to navigate 3D content.<br>
Spec:<br><Br>
1. The enduser must be able to enable an accessibility-mode (which persists across application/webpage restarts)
2. Accessibility-mode must contain a text-input for the user to enter text
3. Accessibility-mode must contain a flexible textlog for the user to read (via screenreader, screen, or TTS e.g.)
4. The `back` command should navigate back to the previous URL (alias for browser-backbutton)
5. The `forward` command should navigate back to the next URL (alias for browser-nextbutton)
6. A destination is a 3D node containing an `href` with a `pos=` XR fragment
7. The `go` command should list all possible destinations
8. The `go left` command should move the camera around 0.3 meters to the left
9. The `go right` command should move the camera around 0.3 meters to the right
10. The `go forward` command should move the camera 0.3 meters forward (direction of current rotation).
11. The `rotate left` command should rotate the camera 0.3 to the left
12. The `rotate left` command should rotate the camera 0.3 to the right
13. The (dynamic) `go abc` command should navigate to `#pos=scene2` in case there's a 3D node with name `abc` and `href` value `#pos=scene2`
14. The `look` command should give an (contextual) 3D-to-text transcript, by scanning the `aria-description` values of the current `pos=` value (including its children)
15. The `do` command should list all possible `href` values which don't contain an `pos=` XR Fragment
16. The (dynamic) `do abc` command should navigate/execute `https://.../...` in case a 3D node exist with name `abc` and `href` value `https://.../...`
# Security Considerations
The only dynamic parts are [W3C Media Fragments](https://www.w3.org/TR/media-frags/) and [URI Templates (RFC6570)](https://www.rfc-editor.org/rfc/rfc6570).<br>