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RESO’s first standard products used the term RETS (Real Estate Transaction Standards) as a prefix to its version number (i.e. RETS version 1.5 through 1.9) All of these versions all collectively known as RETS 1x. RESO will continue to use “RETS” as a prefix for its original standard product but will not do so for products such as Data Dictionary. RETS provided an open specification for how to describe, transfer, and update real estate data, and many vendors are still using it today.

DLU March 6th, 2019