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Welcome to the Real Estate Standards Organization (RESO) Data Dictionary Wiki


This wiki describes and organizes the terms and fields related to the transmission of real estate data. Approved: December 18, 2018.

Getting Started with the Wiki

After reviewing the Introduction pages, 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.

Getting Started with Certification

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

RESO Members: The most recent certification testing specification and approved worksheet can be found on the DATA DICTIONARY WORKGROUP HOME PAGE.

Nonmembers: Static versions of the testing specification are posted here for information purposes only. | TESTING SPECIFICATION (pdf) | WORKSHEET (xlsx) (Last updated November 18, 2020.)

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.

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.

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