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dprod-contracts/README.md

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+# DPROD Data Contracts: Deterministic Policy Language for Data Governance
+
+**An ODRL 2.2 profile with deterministic evaluation semantics for data governance.**
+
+---
+
+## What This Is
+
+DPROD Contracts is an ODRL 2.2 profile. It uses ODRL terms for all standard constructs (Permission, Duty, Prohibition, Agreement, etc.) and only adds extensions where ODRL 2.2 leaves behavior undefined:
+
+1. **Explicit lifecycle**: Pending -> Active -> Fulfilled/Violated (unified for duties and contracts)
+2. **Bilateral agreements**: Both assigner and assignee may have duties
+3. **Deterministic evaluation**: Total functions, no undefined states
+4. **Formal verification target**: Amenable to Dafny, Why3, Coq
+5. **Structured operand resolution**: SHACL-style `dprod:path` property paths
+6. **Recurring duties**: `recurrence` via RFC 5545 RRULE for scheduled obligations
+
+DPROD Contracts is **specification-first**. The semantics document defines what any conformant implementation must do. Every DPROD policy is a valid ODRL 2.2 policy.
+
+---
+
+## Quick Start
+
+See [examples/](examples/) for complete working policies:
+
+- [data-contract.ttl](examples/data-contract.ttl) -- DataContract, Subscription, bilateral duties
+- [data-use-policy.ttl](examples/data-use-policy.ttl) -- Role-based access, purpose constraints
+
+---
+
+## What DPROD Contracts Adds to ODRL 2.2
+
+| Extension | ODRL 2.2 | What DPROD Adds |
+|-----------|----------|-----------------|
+| Duty lifecycle | Undefined | Pending -> Active -> Fulfilled/Violated |
+| Bilateral duties | Unilateral (assignee only) | Assigner duties + assignee duties |
+| Conflict resolution | Configurable | Fixed: Prohibition > Permission |
+| Evaluation order | Undefined | Deterministic left-to-right |
+| Operand resolution | Implicit | Explicit `dprod:path` property paths (+ `dprod:select` for complex resolution) |
+| Recurring duties | -- | `recurrence` via RFC 5545 RRULE with per-instance `deadline` |
+| Contract types | -- | `DataContract` (subclass of Offer), `Subscription` (subclass of Agreement) |
+
+**Note**: DPROD Contracts is an ODRL profile, not a parallel vocabulary. Standard ODRL processors can parse DPROD policies; DPROD-aware processors additionally enforce lifecycle, bilateral duties, and deterministic evaluation.
+
+---
+
+## Design Principles
+
+### 1. Specification Precedes Implementation
+
+The [formal semantics](docs/formal-semantics.md) is the normative reference.
+
+### 2. Total Functions
+
+Every evaluation terminates with a defined result:
+
+```
+Eval : Request x PolicySet x State -> Decision x DutySet
+```
+
+### 3. Bilateral Agreements
+
+Agreements return duties for **both** parties:
+
+```
+Result = {
+    decision: Permit | Deny | NotApplicable,
+    assignerDuties: Set<Duty>,   // Provider obligations (SLAs)
+    assigneeDuties: Set<Duty>,   // Consumer obligations
+    violations: Set<Duty>
+}
+```
+
+### 4. Unified Lifecycle State
+
+Duties and contracts share four states:
+
+```
+         condition true
+Pending ──────────────> Active
+                         │  │
+          action done    │  │  deadline passed
+                         ▼  ▼
+                   Fulfilled  Violated
+```
+
+An `odrl:Duty` progresses through `dprod:State` values. A `dprod:DataContract` shares the same state machine.
+
+### 5. Structured Operand Resolution
+
+Operands resolve via `dprod:path` -- SHACL-style property paths from the evaluation context:
+
+```turtle
+# Context-rooted (single-step): direct property on request
+dprod:environment  dprod:path dprod:environment .
+
+# Asset-rooted (two-step): via odrl:target
+dprod:timeliness   dprod:path (odrl:target dprod:timeliness) .
+
+# Agent-rooted (two-step): via odrl:assignee
+dprod:recipientType dprod:select "SELECT ?v WHERE { $request odrl:assignee/dprod:recipientType ?v }" .
+```
+
+---
+
+## Repository Structure
+
+```
+dprod-contracts/
+├── dprod-contracts.ttl              # Core ontology (ODRL profile extension)
+├── dprod-contracts-shapes.ttl       # SHACL validation shapes
+├── dprod-contracts-prof.ttl         # DXPROF profile declaration
+├── examples/
+│   ├── data-contract.ttl            # Complete contract example (with recurrence)
+│   ├── data-use-policy.ttl          # Access control example
+│   └── baseline.ttl                 # Comprehensive test data (8 contracts, 2 subscriptions)
+└── docs/
+    ├── overview.md                  # What is DPROD Contracts? (start here)
+    ├── specification.md             # Technical vocabulary reference
+    ├── term-mapping.md              # Business term -> property mapping + DCON migration
+    ├── formal-semantics.md          # Formal semantics (normative)
+    ├── contracts-guide.md           # Data contract authoring guide
+    └── policy-writers-guide.md      # Data use policy authoring guide
+```
+
+
+---
+
+## Namespaces
+
+| Prefix | Namespace | Role |
+|--------|-----------|------|
+| `odrl:` | `http://www.w3.org/ns/odrl/2/` | Primary -- all standard constructs |
+| `dprod:` | `https://ekgf.github.io/dprod/` | Extensions (State, deadline, recurrence, DataContract, Subscription, path, select, hierarchy) + domain-specific actions, operands, and concept values |
+
+---
+
+## Conformance
+
+An implementation conforms to DPROD Contracts if:
+
+1. It accepts policies that validate against `dprod-contracts-shapes.ttl`
+2. It uses `odrl:Permission`, `odrl:Duty`, `odrl:Prohibition`, `odrl:Agreement` for standard constructs
+3. Its evaluation function produces identical results for identical inputs
+4. All functions are total (no undefined behavior)
+5. State transitions match the operational semantics
+6. Agreement evaluation returns duties for both assigner and assignee
+
+---
+
+## References
+
+- [ODRL 2.2 Information Model](https://www.w3.org/TR/odrl-model/)
+- [W3C Market Data Profile](https://www.w3.org/2021/md-odrl-profile/v1/)
+- [W3C ODRL Profile Best Practices](https://www.w3.org/community/reports/odrl/CG-FINAL-profile-bp-20240808.html)
+
+---
+
+**Version**: 0.7 | **Date**: 2026-02-04