[RFC 9535](https://www.rfc-editor.org/rfc/rfc9535.html#slice): - [x] Name selector: `.foo` • !146 - [x] Single-quoted • !146 - [x] Double-quoted • !146 - [ ] Usual escape sequences - [ ] Hexadecimal escape sequence - [x] Index selector: `[0]` • !146 - [x] Negative index • !165 - [x] Wildcard selector: `[*]` • !165 - [x] Slice selector: `[1:7:2]` • !165 - [x] Filter selector: `[?<expr>]` • !182 - [ ] Function extension: `length(@.foo)` - [x] Multiple selectors: `[*, 1:2:3]` • !182 - [ ] Descendants: `..[*, 1:2:3]`