Glossary
Acronyms and key terms used across UK property data. Filter live with the search box.
Organisations & bodies
| Term | Full name | Role |
|---|---|---|
| OPDA | Open Property Data Association | UK industry body for digital property data; owns PDTF. |
| DPMSG | Digital Property Market Steering Group | Formed 1 Aug 2023 by HMLR. 14 founding members. Central convening body. |
| HBSG | Home Buying and Selling Group | Industry coordination body. Custodian of BASPI. |
| HBSC | Home Buying and Selling Council | Industry forum. Maria Harris is a member. |
| NTS | National Trading Standards | UK trading standards body. |
| NTSELAT | National Trading Standards Estate and Letting Agency Team | Owned (now-withdrawn) Material Information rules. |
| DBT | Department for Business and Trade | Sponsors Smart Data Challenge; published Smart Data Roadmap. |
| DSIT | Department for Science, Innovation and Technology | Smart Data scheme + DIATF. Hosts Smart Data Council. |
| DCMS | Department for Culture, Media and Sport | Predecessor to DSIT for the data brief. |
| MHCLG | Ministry of Housing, Communities and Local Government | Policy lead for housing/property. |
| DLUHC | Department for Levelling Up, Housing and Communities | Predecessor to current MHCLG. |
| HMLR | HM Land Registry | Operational lead. Formed DPMSG. Runs LLC programme. |
| FCA | Financial Conduct Authority | Smart Data scheme regulator (precedent: Open Banking). |
| ICO | Information Commissioner's Office | Data protection regulator under UK GDPR / DPA 2018. |
| CLC | Council for Licensed Conveyancers | Sandbox delivery partner with OPDA + Raidiam. |
| SRA | Solicitors Regulation Authority | DPMSG founding member. |
| RICS | Royal Institution of Chartered Surveyors | DPMSG founding member. |
| CILEX | Chartered Institute of Legal Executives | DPMSG founding member. |
| COPSO | Council of Property Search Organisations | DPMSG founding member. |
| BSA | Building Societies Association | DPMSG founding member. |
| TPI | The Property Institute | UK industry body for property managers. Hosts NTS guidance mirror. |
| Raidiam | — | Trust-framework operations firm. Sandbox partner. Built UK/Brazil Open Banking. |
| EDM Council | Enterprise Data Management Council | Publishes DCAM (a framework not adopted by OPDA — see ToIP page for why). |
Legislation & policy
| Term | Full name | Role |
|---|---|---|
| DMCC Act 2024 | Digital Markets, Competition and Consumers Act 2024 | Empowers Smart Data scheme designations. |
| DUAA / DUA Act | Data (Use and Access) Act 2025 | Modernises UK GDPR for data sharing. |
| LFRA 2024 | Leasehold and Freehold Reform Act 2024 | Leaseholder reforms; Right to Manage etc. |
| LRA 2002 | Land Registration Act 2002 | Enabled e-conveyancing in law; basis for HMLR digital programmes. |
| RPF | Regulators' Pioneer Fund | UK government innovation fund. Funds the Trust Framework Sandbox. |
| UK GDPR | UK General Data Protection Regulation | UK-adopted GDPR; basis for ICO data sharing rules. |
| DPA 2018 | Data Protection Act 2018 | UK implementation of GDPR. |
| MLR 2017 | Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017 | Identity-verification obligations on regulated participants. |
Standards & frameworks
| Term | Full name | Role |
|---|---|---|
| PDTF | Property Data Trust Framework | OPDA's umbrella standard — JSON Schemas + OpenAPI + Trust Framework spec. |
| ToIP | Trust Over IP Foundation | Linux Foundation project. 4-layer governance model PDTF follows. |
| DIATF | Digital Identity and Attributes Trust Framework | UK government identity trust framework. DSIT-owned. |
| VC | Verifiable Credentials | W3C data model for cryptographically verifiable claims. PDTF v2.0 is VC-based. |
| DID | Decentralized Identifier | W3C standard for self-sovereign identifiers. Used for PDTF participants. |
| VCDM | Verifiable Credentials Data Model | W3C VC spec, versions 1.1 and 2.0 archived locally. |
| DIDComm | DID Communication | Secure-messaging protocol used between DID-identified parties. |
| OIDC | OpenID Connect | Identity layer over OAuth 2.0. Used in PDTF Auth pattern. |
| DCAM | Data Management Capability Assessment Model | EDM Council framework. Not the framework OPDA has chosen (ToIP is). |
| DAMA-DMBOK | Data Management Body of Knowledge | Broader data management reference. Component-level usable. |
| FAIR | Findable, Accessible, Interoperable, Reusable | Data sharing principles. |
| SKOS | Simple Knowledge Organization System | W3C standard for taxonomies / controlled vocabularies. |
| OWL | Web Ontology Language | W3C standard for ontologies. |
| SHACL | Shapes Constraint Language | W3C standard for validating RDF graphs. |
| DCAT | Data Catalog Vocabulary | W3C vocabulary for describing datasets. |
| RDF | Resource Description Framework | W3C foundational data model for the semantic web. |
| JSON-LD | JSON for Linked Data | RDF serialisation in JSON. PDTF's bridge from JSON Schema to RDF. |
UK property forms & data sets
| Term | Full name | Role |
|---|---|---|
| BASPI | Buyer and Seller Property Information | HBSG's industry data set, v4 / v5. Implemented as baspi.json, baspi5.json. |
| TA6 | Law Society Property Information Form (6th ed, 2025) | Implemented as ta6.json. |
| TA7 | Law Society Leasehold Information Form (5th ed, 2025) | Implemented as ta7.json. |
| TA10 | Law Society Fittings and Contents Form | Implemented as ta10.json. |
| CON29R | CON29 Residential search | Standard local authority residential search. con29R.json. |
| CON29DW | CON29 Drainage and Water | con29DW.json. |
| LPE1 | Leasehold Property Enquiry | Standard leaseholder enquiry pack. lpe1.json. |
| OC1 | Office Copy entries (HMLR Title) | HMLR-supplied title register copy. oc1.json. |
| LLC1 | Local Land Charges search | HMLR-provided LLC register search. llc1.json. |
| PIQ | Property Information Questionnaire | Standard PIQ. piq.json. |
| RDS | Residential Data Schema | UK property data schema. rds.json. |
| FME1 | Form for Mortgage Enquiries | fme1.json. |
| UPRN | Unique Property Reference Number | Persistent identifier for UK property addresses. |
Programmes & initiatives
| Term | Full name | Role |
|---|---|---|
| Sandbox | Smart Property Data Trust Framework Sandbox | CLC + OPDA + Raidiam, RPF-funded, DPMSG-governed. Live. |
| SDC | Smart Data Challenge | DBT-sponsored. Moverly+OPDA prototype won an SDCP Innovators prize. |
| SDCP | Smart Data Challenge Prize | The award stream within SDC. |
| LLC Programme | Local Land Charges Programme | HMLR-led migration of council LLC registers to a national digital service. |
| Open Banking | — | UK precedent for sector-specific trust framework + standards body separation. |
Concepts (PDTF-internal)
| Term | Definition |
|---|---|
| Trust Framework | Agreements + rules + technical standards by which organisations exchange verified data. |
| Verified Claim | A data assertion with attached provenance — who said it, when, with what evidence. |
| Overlay | An optional extension to the base PDTF transaction schema (e.g. baspi5.json). |
| Property Pack | The bundle of standardised property data that accompanies a transaction. HBSG initiative. |
| Accreditation | OPDA's scheme for certifying members as trusted PDTF participants. |
| Trust Registry | Authoritative list of who is authorised to do what within a trust framework. |
Original sources for the glossary entries: OPDA website, gov.uk announcements,
DPMSG founding statement, propdata.org.uk About page, W3C and Trust Over IP
Foundation specs — all archived in source/.