xml - standard,
in germany a standard-xml-scheme for real-eastes (
OpenImmo: Startseite) has been set up in 2001, we use this standard to import with cronjobs from data-input from different agents on an austrian real-estate-platform.
getting the updates you have different possibilities:
* delete agents objects and import complete set of objects
* using a "status"-field to remove an re-activate objects
for the image-import there ar at least to ways:
* having the image-information included in an import/zip-file or
* having online the image paths include and download from agents websites to yours
maybe the info and the standard is a useful approach for not having "translate" each agents data ...