A client recently asked us the following question (paraphrased):
"Can you check with your developers on what (if any) interfaces are made available for other systems to integrate with Drupal 6. I thought it was possible there would be some services offered up which would allow systems (such as our XYZ portal) to reach out and query Drupal and then make use of that data in reports, etc."
In particular, the data they are interested in querying is all stored in CCK nodes.
I am aware of the following possibilities, and am researching contrib for more:
Thanks to the services module and a few others, the following kinds of services should be available: * XML-RPC * AMFPHP * JSON * REST * SOAP
Core itself provides an RSS feed service. There are modules for KML and GeoRSS feeds as well.
The RDF framework provides a whole basket of RDF interfaces.
Does anyone have any other ideas I should take a look at with respect to the above question?
Thanks, -- ..chris