eelixduppy - 4:56 pm on Jul 5, 2012 (gmt 0)
Hi and Welcome to WebmasterWorld
I'm not particularly familiar with the RETS protocol or the PHRETS api.
But if neither of these support the exact queries you would like to filter on, then it is likely you are going to need to do some additional filtering on your side. You would send their service a query that is as specific as possible, and anything else you filter before printing it to the user of your site.