A note's relationship with its prototype, i.e. the note name set in $Prototype, as stored as a basic link, i.e. in the TBX's <links> linkbase.
Importantly, this form of link is not drawn or counted (e.g. as in $ChildCount) as whilst generically a basic link it is essentially 'behind-the-curtain' use. If treated as a normal link it would throw link counts off by one and and noise to maps using prototypes.
If necessary, the visibility of the 'prototype' link type can be turned on in two contexts:
- Document Inspector, Links tab, where the type can be selected and then ticked to be made visible. 'prototype' link lines will then be visible in Map and Timeline view where pertinent. The setting is global and reversible, i.e. visibility can be turned off again.
- Roadmap. By default this pop-over/stand-alone dialog includes prototype links but their inclusion can be toggled in/out (globally for Roadmap use) via a tick-box.