wall EXT-1 W1 from (grid.A, grid.1) to (grid.B, grid.1)
start/end/mid are the carrier core; the extrusion contributes
centerline/top/base and the face traces, and refines the carrier
datums’ shape to plumb lines.
Placement: the line grammar — from … to …, or carrier + extents
(from wall.W1 to wall.W3 at 4' right of grid.A, along grid.A). That is the segment
spelling; curve and surface spellings are reserved for the same slot.
Parameters
| Word | Accepts | Required | Meaning |
|---|---|---|---|
widthwidth 8" | length | type · one of: width · layers, not both | the assembly width — one layer, all core |
layerslayers [gyp 5/8", core: stud 3-1/2", gyp 5/8"] | layers list of material | type · one of: width · layers, not both | the assembly, left to right in the travel frame; core: marks the structural runeach layer’s material is a free word today, used as a key by the graphics standard; it becomes a reference into the material vocabulary in the materials era |
notenote "rated partition" | text | type · optional | a free-text note on the type |
typeEXT-1 | a walltype | instance · required | the walltype, leading the statement — its width or layers place the faces |
fromfrom (grid.A, grid.1) | line (direction z) or plane (normal xy) | instance · required | where the line starts: a plan point, or a plane it runs from on a carrier placement with a carrier clause — the along, left and right rows, read after to — from and to name the planes the line runs between; the clause’s offset is a length inside it, not a row |
toto (grid.B, grid.1) | line (direction z) or plane (normal xy) | instance · required | where the line ends: a plan point, or a plane it runs to on a carrier placement |
alongalong grid.A | plane (normal xy) or line (direction xy) | instance · optional | the datum the line rides — it runs in that plane, or follows that line, between from and to |
leftat 9' left of grid.B | plane (normal xy) | instance · optional | the datum the offset measures from, on the left of travel spelled left of, with the offset before it: at <offset> left of <datum> |
rightat 4' right of wall.W2 | plane (normal xy) | instance · optional | the datum the offset measures from, on the right of travel spelled right of, with the offset before it: at <offset> right of <datum> |
justifyjustify left foc | centerline · left · right · core.centerline | instance · required · default: centerline revit-parity — Revit’s Location Line default is Wall Centerline | which plane of the assembly the from/to line holds a side may add its face word: foc/fos/fom hold the core face, fof the finish face — what a bare side already means |
flipflip | flag (the bare word) | instance · required · default: off practice — layers read left→right in the travel frame unless flipped (decision 66) | mirror the layer order across the line |
basebase level.L1 - 6" | a level ± offset | instance · required · default: the file’s level revit-parity — Base Constraint + Base Offset — the level the wall is placed on; the file’s level statement, or the unit’s one level, is that level (decision 74) | the level the wall stands on, ± an offset |
toptop level.L2 | a level ± offset or plane (normal z) | instance · one of: top · height, not both (default: the wall’s level’s top)practice — a story is a fact about the building, stated once on the level — decision 74 | the level the wall reaches, ± an offset |
heightheight 9'-0" | length | instance · one of: top · height, not both (default: the wall’s level’s top) | the wall’s height above its base — the other spelling of top |
Reserved
| Word | Rung | Meaning | Arrives with |
|---|---|---|---|
function | instance | what the wall does in the building (Revit’s Function) | the wall worksheet’s second pass — decided at decision 65(e), not yet a clause |
structural-usage | instance | whether the wall bears, shears, or neither (Revit’s Structural Usage) | the structure era |
room-bounding | instance | whether the wall bounds rooms — today every wall does | the furred or decorative wall that must not bound a room; bounding is per story since decision 74 |
label | instance | what the tag prints when it is not the id | a bubble or tag printing text other than the id — the grid’s bubble is the one that ships |
phase | instance | the phase this element is created in | the phasing era — phases are an ordered list declared in their own file, and a view looks at the model as of one |
demolished | instance | the phase this element is demolished in | the phasing era — phases are an ordered list declared in their own file, and a view looks at the model as of one |
Datums
| Datum | Shape | Status | Resolution | Rule |
|---|---|---|---|---|
start | line (plumb) | core | operational | The declared from coordinate, on the justify line. Swap the endpoints and start moves with the declaration, dependents following. |
end | line (plumb) | core | operational | The declared to coordinate, on the justify line — what perimeter chaining connects to. |
mid | line (plumb) | open (§10) | operational | Midpoint of the drawn line. Ships only if a real layout wants it; referencing it names the open question. |
centerline / cl | plane | core | intrinsic | The ASSEMBLY’s center plane, transverse normal (cl is the field spelling — NCS M5 CL, decision 65; one plane, printed as written). Carrier refs and expressions use it regardless of justify (axis-aligned walls only in v0.2 — a diagonal wall’s plane is not x̂- or ŷ-normal). Differs from core.centerline on asymmetric assemblies. |
core.centerline / core.cl | plane | core | intrinsic | The center plane of the core: layers (Revit’s Core Centerline — the sixth privileged reference, decision 66). Coincides with centerline when the non-core layers are symmetric and on width-only types. Measurable in past/short of; a justify core.centerline hold; expression slots as centerline. |
fos / foc / fom (pair) | plane (×2) | core | geometric (side) | The structural CORE face — ONE plane in three field spellings (face of stud / concrete / masonry unit; NCS M4 §4.2.8.3.1 method 1; decision 65), preserved as written; the spelling that disagrees with the core layer’s material is the first warning once that severity exists. A pair: in past/short of the tape picks the face facing the measurement (far for past, near for short of); in justify the side word picks (justify left foc). Expression slots need a side and teach (D0327). Type-stable: invariant under finish changes. |
fof (pair) | plane (×2) | core | geometric (side) | The FINISH face (NCS M5 FOF, method 3 — “only when required by the project”; decision 65). The v0 wall’s outer faces. Same pair rules as the core face. ff is reserved (NCS: finish face and far face — held for far face; teaching error). Bare justify left/right already holds this plane. |
.face / .core / .fow | — | retired | — | Decision 36’s invented spellings, revised forward by decision 65: the field’s own words replace them (D0326 teaches fof / fos·foc·fom). .core.centerline is legal — the bare .core is not a plane. |
top | plane | core | intrinsic | ẑ position of the wall’s top (from height/top resolution). Consumable in the wall top slot: wall W2 … top wall.W1.top. |
base | plane | core | intrinsic | ẑ position of the wall’s base (its level’s elevation). |
Roles
layer · profile · sweep