Strategic alignment

The five external frameworks and strategies PDTF publicly aligns to. Each one constrains the design space — and each one is a stakeholder relationship to maintain.

Published positioning

From propdata.org.uk's About page, PDTF lists five "Strategic Alignment" partners: HMLR Strategy 2022+, DSIT National Data Strategy, DVSTF, W3C Verifiable Credentials, and the Trust Over IP Foundation.

Provenance: propdata.org.uk is a legacy developer site that carries OPDA copyright but was not authored or approved by OPDA (OPDA has no editing access). Its positioning is recorded here for reference; specific technical approaches it presents — notably Decentralised Identifiers (DIDs) — are exploratory, not yet OPDA / MHCLG / DPMSG-ratified.

The five alignments

flowchart LR PDTF["`Property Data Trust Framework`"]:::infra HMLR[HMLR Strategy 2022+]:::service DSIT[DSIT National Data Strategy]:::service DIATF["`DVSTF Digital Verification Services Trust Framework`"]:::service VC[W3C Verifiable Credentials]:::data ToIP[Trust Over IP Foundation]:::data PDTF --- HMLR PDTF --- DSIT PDTF --- DIATF PDTF --- VC PDTF --- ToIP

PDTF's published Strategic Alignment partners.

HMLR Strategy 2022+

HM Land Registry's published business strategy from 2022 onwards. Property modernisation, digitisation of registers, Local Land Charges Programme, the national LLC service that's been rolling out council-by-council since 2018.

PDTF aligns by:

Schema overlays for HMLR-managed forms (OC1, LLC1, CON29DW)
Architectural compatibility with HMLR's national LLC service
Maria Harris on the DPMSG-equivalent forums HMLR convenes

DSIT National Data Strategy

The cross-government strategy for unlocking the power of data (originally DCMS-published, now DSIT-owned). PDTF positions itself as a sector-specific implementation of the strategy's principles — particularly around Smart Data and trusted data sharing across organisational boundaries.

DVSTF — Digital Verification Services Trust Framework

UK government's published trust framework for digital verification services (the rename of the former DIATF). Run by DSIT. Property transactions involve heavy ID checks (estate agent, conveyancer, lender — each currently does their own). DVSTF's stated goal is to enable "verify once, use many times" identity proofing.

PDTF aligns by:

Using W3C VCs / DIDs for participant identity — compatible model
The PDTF DID Auth OAuth 2 Specification (in trust-framework/docs/) draws on DVSTF concepts
Future: PDTF accreditation could recognise DVSTF-certified IDPs

W3C Verifiable Credentials Data Model

The W3C standard for cryptographically verifiable claims about subjects. The SPDTF (Smart Property Data Trust Framework) is being structured around VCs — every property data point is a claim, with provenance, issued by an accredited participant, presented to relying parties.

Our archive includes both VC Data Model 1.1 and 2.0 specs locally at source/08-external-references/related-w3c-specs/.

Trust Over IP Foundation

Linux Foundation project. The 4-layer governance + technical stack model that PDTF directly adopts. See the dedicated ToIP governance page.

Implicit alignments — not on the published list but worth tracking

Five more relationships that effectively shape the design space, even though OPDA hasn't formalised them as "Strategic Alignment":

Framework / standard	Why it matters
UK Open Banking (OBL → JROC)	The direct precedent. propdata.org.uk's own tagline: "Open Banking for Property Data". Raidiam — Sandbox partner — operates the UK Open Banking Directory. Borrow patterns wholesale.
EU Data Spaces / IDS-RAM	European federated data ecosystem governance. Worth tracking for cross-border interoperability optionality, especially with Northern Ireland / Irish property transactions.
Schema.org	Used by Rightmove, Zoopla and most UK property listing sites. PDTF semantic model should align where they overlap (Property, Place, ResidentialAddress).
FAIR data principles	Findable, Accessible, Interoperable, Reusable. PDTF's "open" positioning maps directly onto FAIR.
W3C Data on the Web Best Practices (DWBP)	35 best practices for publishing data on the web. Practical checklist for PDTF's published artefacts (schemas, examples, contexts).

Alignment KPIs we could propose

To make these alignments operational rather than nominal, each should have measurable criteria. Suggested first cut:

HMLR — every HMLR-published form has a PDTF overlay; LLC1 / OC1 conformance test suite passes.
National Data Strategy — public data assets in PDTF have dcat: metadata for discoverability.
DVSTF — PDTF accreditation cross-recognises at least one DVSTF-certified IDP.
W3C VC — SPDTF conforms to VCDM 2.0 test suite.
ToIP — published governance documents for all 4 layers + cross-cutting docs (per ToIP page).