When it is used
Put a token in an <a> href and nanoesis infers a link field. The author can point it at another page on the site, or at an external address.
It is inferred from the tag. Internal links are stored as references, so they survive the target page being renamed or moved.
Example
A token in a link, with a second token for the label:
<a href="{cta_link}">{cta_label}</a>In the editor
In the editor this is a link control: a picker for choosing an internal page, or a box for typing an external URL.
Pair it with a short text label, as above, so the author can set both the destination and the wording.