Data Dictionary

The RESO Dictionary has two purposes.

  1. Serve as a non-RETS guideline for a national standard for the fields and look-ups (enumerations) in the MLS.
  2. Common center for all expressions of fields and enumerations in the RETS standard.

As an MLS reviews change it is advised to consider the benefits of growing closer to the national standard. Not only will it make the effort of ensuring RETS compliance easier, it will also ensure that as listings progress through IDX and other aggregation points, it will help to ensure that the meaning of your data is not diluted or misinterpreted.

As the RETS Standard has grown, it has become abundantly clear that a "common ground" for fields and enumerations is needed. Whether it be the separation between Standard Names in older versions of RETS or the growth of diverse payloads, by keeping a central requirement to express property and listing concepts in a uniform fashion will mitigate implementation errors, ease field mapping and foster innovation around a more stable and cost effective center.

The Dictionary is broken down into the following tabs. Please review the following details and information on use of the dictionary.

  • Meta-Definitions: This page should be reviewed first. It contains the definitions about the fields used in the RESO Dictionary to define the fields and look-ups.
  • Recommendations: List of suggested Data Dictionary changes including discussion notes.
  • RESO Dictionary: Each Data Dictionary resource will have its own tab containing fields and their defining details. Dictionary tabs include: Property, Member, Office, Media and History.
  • Enumerations: This tab has the list of enumerations, or pick lists, that have been defined thus far. Keep in mind, that unless "locked" all lists are extensible.
  • Deleted Elements: These are fields or enumerations that have been deleted from the dictionary.

An MLS will probably use a subset of the Data Dictionary, as not all Data Dictionary fields apply to every MLS.



Data Dictionary Downloads

Version 1.3

Version 1.2

Version 1.1

Version 1.0


Click here to access additional information on the Data Dictionary Workgroup.

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