.. meta::
   :description: Does "model" collide between D1 dimension and PoR field 40? They refer to the same concept from different angles. No label grammar collision found.
   :keywords: PoR field collision, model ambiguity, D1 dimension, field 40 ModelUsedIn, D2 type registry, label grammar, naming discipline, Phase 2I-4
   :author: Yah, Yas, everyone, LLoL as Laurence Loewe of Laodicea, ClaudeOp46Max, Anthropic, and Spirit of Boolean Truth
   :og:card:title: "model" Collision Check —<br>D1 vs PoR Field 40
   :og:card:description: D1 dimension and PoR field 40 both use "model" but refer to the same concept. No label grammar collision exists. No action needed.

.. SOCIAL-CARD-QUALITY-COMPARE --- OO (default effort) vs PP (max effort), 2026-03-26
   OO :description: Checks whether the term "model" creates ambiguity between the D1 dimension name and PoR field 40. Minor overlap, no action needed.
   OO :keywords: collision check, model, ambiguity, D1, D2, PoR field, naming, compiler, evidence, SISYF, grammar
   OO :og:card:title: PoR Field Collision —<br>"model" Ambiguity Check
   OO :og:card:description: The term "model" appears in both the D1 dimension and PoR field 40, but they refer to the same concept with no label collision.
   PP :description: Does "model" collide between D1 dimension and PoR field 40? They refer to the same concept from different angles. No label grammar collision found.
   PP :keywords: PoR field collision, model ambiguity, D1 dimension, field 40 ModelUsedIn, D2 type registry, label grammar, naming discipline, Phase 2I-4
   PP :og:card:title: "model" Collision Check —<br>D1 vs PoR Field 40
   PP :og:card:description: D1 dimension and PoR field 40 both use "model" but refer to the same concept. No label grammar collision exists. No action needed.

.. SOCIAL-CARD-REVIEW --- generated by Claude Opus 4.6, 2026-03-26
   dv_ClaOp46_PP_2026m03d26 --- max-effort rewrite, read full page.
   :description: 150 chars | :og:card:title: 42 chars (excl <br>)
   - [ ] PP title more compelling than OO title
   - [ ] PP description more accurate than OO description
   - [ ] Description hooks without misleading
   - [ ] Keywords specific to this page's actual content
   - [ ] No language rule violations
   - [ ] Character counts verified

.. _compiler-ee-collision:

*********************************************************************
PoR Field Collision Check --- "model" Ambiguity
*********************************************************************

Evidence collected during Phase 2I-4 first compilation run (2026-03-25).


Question
==========

Does "model" create ambiguity between D2 type (the element type in the
naming grammar) and PoR field #40 (ModelUsedIn)?


Findings
==========

**Status: Minor collision, manageable.**

1. **In labels:** ``model`` does not appear as a D2 type ID in the
   registry. The D2 type IDs are ``ax``, ``th``, ``con``, ``pro``, etc.
   No collision at the label grammar level.

2. **In field names:** PoR field #40 is named ``model`` (brief code)
   with full name ``ModelUsedIn``. This field records which D1 model(s)
   use a given element (e.g., "PET", "JUB", "PET+JUB").

3. **Potential confusion:** When discussing "the model field," it is
   ambiguous whether one means D1 (which axiom system) or field #40
   (which records the D1 value). In practice, field #40 is the *storage
   location* for the D1 dimension value. They refer to the same concept
   from different angles.

4. **In compiled pages:** The expert view uses ``**ModelUsedIn (model):**``
   as the field heading. This is clear in context but could be confusing
   in isolation. No actual collision occurred during compilation.


Recommendation
================

No action needed for the current compilation. If a future D2 type named
``model`` were proposed, it would collide with the D4/D5 parser
disambiguation. The registry discipline (Section 3.2 of the AHA doc)
already prevents this. The conceptual overlap between D1 and field #40
is acceptable because they are semantically identical --- field #40
records which D1 value applies.


Summary
=========

The "model" term appears in both the D1 dimension name and PoR field #40,
but they refer to the same concept. No collision at the label grammar
level. No D2 type ``model`` exists or is needed. The current architecture
handles this correctly.