how to choose between Document and RPC oriented webservices?

hi, I'm using BEA webloigc8.1 for my webservices project, I'm not sure whether I should choose Document-oriented or RPC-oriented webservices?

I know that for document-oriented, webservices only have 1 parameter, which is an XML document. does it mean that it provide loose-coupling?

Could anyone here tell me what's the best practices to build webservices application on Weblogic8.1 platform?

This article talks about the various styles and their properties.

[Added later:] This article may be even more useful.
[ October 16, 2005: Message edited by: Ulf Dittmer ]