# The CIRPASS-2 Validation Stack for Textile DPP

## Executive Summary

Textile DPP compliance fails when data is only collected and not verified.  
The CIRPASS-2-compatible Reeco stack applies seven validation layers: `SCH`, `MDL`, `SEM`, `TXT`, `RCO`, `DCC`, `DTE`.

## Why a Multi-Layer Stack Is Required

Most platforms stop at "document present". That does not prove product-level claim integrity.  
A robust DPP workflow must validate structure, semantics, textile logic, and mass-balance coherence.

### Layer Overview

| Layer | Scope | Typical Output |
|---|---|---|
| SCH | Schema conformance | Structural errors (for example `SCH001`) |
| MDL | Model integrity | Missing fields or malformed objects (`MDL*`) |
| SEM | Semantic consistency | Contradictory meanings (`SEM*`) |
| TXT | Textile logic | Textile-specific claim inconsistencies (`TXT*`) |
| RCO | Reeco control layer | Hard business controls (`RCO003` mass balance) |
| DCC | Credentialization | TC exported as UNTP DCC 0.6.1 |
| DTE | Traceability events | Batch flow exported as TransformationEvent |

## Validation Performance Posture

For deterministic checks on structured payloads, core validation can execute in milliseconds (reference benchmark: around `1.6 ms` per request in lightweight runs).  
This is operationally relevant: controls can run synchronously at submission time, before label emission.

## What Competitors Usually Miss

| Capability | Typical DPP UI | Reeco Stack |
|---|---|---|
| File upload | Yes | Yes |
| Schema checks | Partial | Full SCH + MDL |
| Textile semantic rules | Rare | SEM + TXT |
| Hard mass-balance block | Rare | RCO hard block |
| UNTP DCC export | Rare | Native |
| UNTP DTE export | Rare | Native |

## Implementation Notes

### Endpoints

- `POST /api/v1/dpp/validate`
- `POST /api/v1/dpp/export/dcc`
- `POST /api/v1/dpp/export/dcc/jwt`
- `POST /api/v1/dpp/export/dte`

### Spec Versioning

- UNTP reference: `0.6.1`
- Evidence model: W3C Verifiable Credentials

## FAQ

### Is schema validation enough for compliance?

No. Schema checks confirm shape, not truthfulness of sustainability claims.

### What makes RCO different?

RCO adds hard operational controls such as mass-balance blocking when certified material is exhausted.

### Why include DCC and DTE in the same stack?

Because validation without exportable evidence is not interoperable compliance.