2fcc9ed140
Works as so:
index.d2:
```d2
x: @x
```
x.d2:
```d2
label: meow
shape: circle
```
TODO:
- [ ] Correctly import into fields by handling the scenarios/steps overlay.
- And links.
- [ ] Test every kind of import.
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| .. | ||
| classes | ||
| edges | ||
| fields | ||
| imports | ||
| layers | ||
| scenarios | ||
| steps | ||