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Rename: NullEle -> Placeholder Element #101

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Rename: NullEle -> Placeholder Element #101

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f9d905b
`Empty` Element
ax3l Oct 29, 2025
968a1e9
Name: `Placeholder`
ax3l Nov 11, 2025
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12 changes: 6 additions & 6 deletions source/element-kinds.md
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Expand Up @@ -386,18 +386,18 @@ Element parameter groups associated with this element kind are:
- [**TrackingP**](#s:tracking.params): Tracking parameters.

%---------------------------------------------------------------------------------------------------
(s:nullele)=
## NullEle Element
(s:placeholder)=
## Placeholder Element

Placeholder element used for bookkeeping when constructing the expanded lattice.
This element is empty, zero length and does nothing.
This element has zero length and does nothing.
This element can be used as a [`base_item`](#s:placement) element for [superpositions](#s:superposition).
Additionally, this element can be used, for example, to denote an invalid element in the internal
structures defined by a program.

`NullEle` elements present in a lattice file will, as a part of lattice expansion, be removed.
That is, `NullEle` elements will never be present in the final expanded lattice and
tracking through a `NullEle` will never be needed.
`Placeholder` elements present in a lattice file will, as a part of lattice expansion, be removed.
That is, `Placeholder` elements will never be present in the final expanded lattice and
tracking through a `Placeholder` will never be needed.

This element does not have any associated parameter groups.

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