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A disputed reading of a reference

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# A disputed reading of a reference

## Intention

I want to split two readings of a reference across bridges and not create a self-cycle of unknownness.

Each reading of the reference gets its own bridge; neither bridge tests the unknownness of the shared head.

## Incorrect form and why it stays silent

```law title="Incorrect form"
rule ListBridge strict { for p: Person; when listed(p) and not_known(admitted(p)); then admitted(p); }
```

The conclusion depends on its own absence: a negative cycle, LDC-E4102. A dispute about where to take the ground from is expressed by two bridges, not by checking unknownness of their shared head.

## Correct form

Minimal standalone form:

```law
language "law.core" version "0.2";
package recipes.z.r06 version "0.1.0";
namespace "urn:recipe:z-interpretations:06";

source Standard { kind standard; jurisdiction "none"; }
edition Edition of Standard { language ru; officiality official; in_force [@2026-01-01, infinity); }
fragment Clause in Edition { kind paragraph; locator "1"; text ru official "Учебная норма допускает два прочтения."; }
entity Person;
relation listed(p: Person);
relation licensed(p: Person);
relation admitted(p: Person);
rule ListBridge strict { for p: Person; when listed(p); then admitted(p); }
rule LicenceBridge strict { for p: Person; when licensed(p); then admitted(p); }
interpretation ListReading of Clause { status disputed; include ListBridge; }
interpretation LicenceReading of Clause { status disputed; include LicenceBridge; }
interpretation_group Reference { alternatives ListReading, LicenceReading; selection exactly_one; }
```

## Frozen execution scene

| Facts and choice | Question | Answer |
|---|---|---|
| 1. only a record, no choice | `admitted` | `NEITHER` / `INTERPRETATION_REQUIRED` |
| 2. a record present, list bridge chosen | `admitted` | `TRUE_ONLY` / `COMPUTED` |
| 3. same facts, licence bridge chosen | `admitted` | `NEITHER` / `COMPUTED` |

```law
test "record only, no choice" {
    given {
        context {
            legal_time @2026-09-13;
            decision_time @2026-09-13T09:00:00+05:00;
            knowledge_time @2026-09-13T09:00:00+05:00;
            timezone "Asia/Almaty";

        }
        assert listed(entity_ref("urn:recipe:z-interpretations:06:p"));
    }
    evaluate truth(admitted(entity_ref("urn:recipe:z-interpretations:06:p")));
    expect truth_status == NEITHER;
    expect evaluation_status == INTERPRETATION_REQUIRED;

}
```

```law
test "record with list bridge chosen" {
    given {
        context {
            legal_time @2026-09-13;
            decision_time @2026-09-13T09:00:00+05:00;
            knowledge_time @2026-09-13T09:00:00+05:00;
            timezone "Asia/Almaty";
            interpretation ListReading;
        }
        assert listed(entity_ref("urn:recipe:z-interpretations:06:p"));
    }
    evaluate truth(admitted(entity_ref("urn:recipe:z-interpretations:06:p")));
    expect truth_status == TRUE_ONLY;
    expect evaluation_status == COMPUTED;

}
```

```law
test "same facts, licence bridge chosen" {
    given {
        context {
            legal_time @2026-09-13;
            decision_time @2026-09-13T09:00:00+05:00;
            knowledge_time @2026-09-13T09:00:00+05:00;
            timezone "Asia/Almaty";
            interpretation LicenceReading;
        }
        assert listed(entity_ref("urn:recipe:z-interpretations:06:p"));
    }
    evaluate truth(admitted(entity_ref("urn:recipe:z-interpretations:06:p")));
    expect truth_status == NEITHER;
    expect evaluation_status == COMPUTED;

}
```



## Counterfactual

Sidecar mutation: `when listed(p);` → `when listed(p) and not_known(admitted(p));`; expected `LDC-E4102`. Additional scenes with fragment deletion are marked in the table; the outcome is checked by both evaluators.

## Boundary

Crossing a bridge does not automatically carry the terms or the competence of another norm.

## Pitfall

Testing the unknownness of one's own head is a negative cycle, rejected with LDC-E4102.