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RESO Committees and Workgroups

Specifications are a cumulative effort. Volunteers have worked to standardize the definitions and forms that MLSs use countrywide. The goal is to create data-sharing policies that provide a single point of entry to search multiple MLS data sets to the benefit of all. Please follow the links below to learn more about the RESO Technical Committee and the RESO workgroups. If you are interested in participating on a workgroup, please contact RESO Headquarters.


Technical Committee


Data Dictionary

The RESO Data Dictionary has two purposes.  First is to serve as a non-RETS guideline for a national standard for the fields and lookups (enumerations) in the MLS.  The second is as a common center for all expressions of fields and enumerations in the RETS standard. The workgroup purpose is to maintain and develop the Dictionary.

Internet Tracking

Internet Tracking data is a key component for any modern day data set. No longer is having the data secure and readily available enough. True analytics that show value are now expected and commonplace in the software industry. This workgroup would propose a recommended standard for tracking RETS vendor  activity, including the MLS listing.


The RESO Unique Property Identifier workgroup addresses the issues resulting from the disparate set of identifier formats used to identify listing property records by creating a standard for a Unique Property Identifier (PUID). This workgroup will review and build on efforts from the U.S. government, public records industry and other data standards organizations to build the U.S. “definitive” standard for the Universal Property Identifier to be used for the North American real estate industry.

Research and Development

The purpose of the RESO Research & Development Workgroup is to solicit and review submitted business cases from the real estate community and identify how RESO can contribute to the benefit of that business process.


The charter of this workgroup is to maintain and update the RETS 1x standard based on current needs, changes involving security, certification and data dictionary.

Transport/Web API

The mission of the Transport Workgroup is to provide technical processes for analyzing extensions to transport methods in current and future versions of the RETS specification. The current focus is to provide an up to date industry standard RESTful Web API interface for real estate transactions.

DLU 09/15/2015