This wiki describes and organizes the terms and fields related to the transmission of real estate data. Please review the Introduction pages and familiarize yourself with the left-side navigation bar for items like Resources, Groups, Fields and Lookups. Each item includes a definition, attributes and points of integration. See Data Dictionary Terms and Meta Definitions for additional meanings of terms within a page. If you want to be part of the real estate data conversation, please join our growing ranks as a RESO member. Membership includes free certification. DD 1.7 Approved: December 18, 2018.

Data Dictionary 1.7 is the most current version for RESO certification testing purposes.

RESO Members: Certification testing specification and approved worksheet are located on our Data Dictionary Workgroup home page.

Nonmembers: Static versions of the testing specification and accompanying worksheet are posted for information purposes only: RESO Data Dictionary Testing Specification.pdfRESO Data Dictionary 1.7.xlsx (files last updated July 6, 2021).

Mobile Users

The Data Dictionary Wiki is built upon Confluence, a web-based wiki. The Data Dictionary is searchable within the Confluence app, but switching to the desktop version while using Chrome, Safari, Firefox and other mobile browsers will offer wider visibility of the left-side navigation pane.

Recent Past Data Dictionary Wikis

Data Dictionary 1.6

Data Dictionary 1.5


The RESO Data Dictionary was the result of a collaborative effort among numerous industry experts who volunteered their time, insight, and expertise to the project.  | LIST OF CONTRIBUTORS

Page Revision Date: November 18, 2020.