The MLS IDX API follows the Real Estate Transaction Standard (RETS) version 1.7.2 as closely as possible. However, there are a few important differences between this service and a fully certified RETS server:
- Compact and Compact-Decoded Formats
These formats are currently available only for Property searches. Compact responses use the RESO Data Dictionary, which as of Version 1.0 only provides a Property dictionary. Once Agent and Office dictionaries are finalized, support for these formats will be added. - Query Restrictions
Ad-hoc querying of records is not supported. Any filtering of results must be configured by the feed owner before data is retrieved. - Select Limitations
The Select function is only supported for Property queries in Compact or Compact-Decoded format. - Server Limits
A strict limit is enforced on the number of details that can be returned in a single Search request. Any Search request exceeding this server maximum will be rejected.