In Amos's XML-RPC HOWTO, he writes: It would be an interesting project (hint, hint) to write an XML-RPC Method Zope Product that was smart about caching, etcetera. This would make XML-RPC available from DTML in a safe form. I can take hints, and have a need for easier access to XML-RPC. So, what should an XMLRPCMethod look like? One idea is that it has a single property, the URL for an XML-RPC server. You would set this to http://othersite/zope/ or whatever. Assuming your method was given an ID of 'rpcserv', you could then write DTML like: <!--Use the standard_html_header of another Zope site (!) --> <dtml-var "rpcserv.standard_html_header()"> <dtml-in "rpcserv.listUsers()"> ... </dtml-in> This would be better named XMLRPCServer than *Method. Alternatively, by analogy with ExternalMethods, an XML-RPC Method could pin things down to a single method; you might create one for listUsers() on a given server, another for standard_html_header() on that site, etc. I don't like this, because it means you may have lots of different method objects, and when a server moves, a lot of updating is required. Too inflexible for my taste. You could make updating server URLs easier by doing something similar to DAs and SQLMethods, having XMLRPCMethods use a given XMLRPCServer object, just as SQLMethods use a given database object. This strikes me as over-engineering the problem, though, resulting in two new object types, and is still rather inflexible. Caching is an interesting problem. Who can know whether a given XML-RPC method is returning relatively static data that's constant for several hours, or transient data that changes a lot? Only the XML-RPC server, and maybe the caller, can know this. I don't think a solution is possible until XML-RPC supports some way to signal whether a method's results are cacheable or not, so I don't think caching is possible at this point in time. -- A.M. Kuchling http://starship.python.net/crew/amk/ Aristocrats need not be rich, but they must be free, and in the modern world freedom grows rarer the more we prate about it. -- Robertson Davies, "Osbert Sitwell"