The Real Estate Transaction Standard (RETS) is a legacy multiple listing standard that is being replaced by the RESO Web API. While many MLS boards will continue to support RETS, over time your application will likely need to support the RESO Web API.
RETS feeds are complex. They also tend to have a lot of variance based on the MLS system, the RETS version used, etc. If you are creating an application that relies on a RETS feed, you will need an experienced RETS developer.
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I have worked with over 50 different RETS feeds throughout the USA and can help you navigate these feeds and parse the data properly and also help you transition from RETS to RESO Web API.
If you'd like to learn more, please contact me!
It's never cheaper and never faster to do this twice (or more!).