Validation Rules

RULE1..RULE12

1. RULE1: no duplicate media_urns.
2. RULE2: sources must not be empty.
3. RULE3: multiple stdin sources must use identical stdin media URN.
4. RULE4: no duplicate source type inside one arg.
5. RULE5: no duplicate positional index across args.
6. RULE6: positions must be 0-based sequential with no gaps.
7. RULE7: one arg cannot have both position and cli_flag.
8. RULE8: unknown source keys rejected by serde deny_unknown_fields.
9. RULE9: no duplicate cli_flag across args.
10. RULE10: reserved CLI flags are forbidden (manifest, --help, --version, -v, -h).
11. RULE11: cli_flag is used verbatim.
12. RULE12: argument identity is media_urn; no separate name key.

Schema Validation Flow

1. Resolve media URN via cap-local specs, then registry.
2. If resolved spec has no JSON schema, skip schema check.
3. Compile Draft-07 schema (cached by schema JSON).
4. Validate argument/output JSON value; return detailed validation errors on failure.

Test Anchors

• capdag/src/cap/validation.rs:1232 (RULE-series tests)
• capdag/src/cap/validation.rs:1244

References

• capdag/src/cap/validation.rs:823, capdag/src/cap/validation.rs:839
• capdag/src/cap/schema_validation.rs:53, capdag/src/cap/schema_validation.rs:94, capdag/src/cap/schema_validation.rs:149