To clarify, all I want to provide is the back-end interface for an application. So, for the blogging example, I'd create an interface allowing any application to show / make / administer posts; search for specific text, etc.

Or, for example provide an interface to a Sales Ledger with the facility to post invoices, add customers, etc.

One thing I cobbled up years ago, from nothing more complex than the old Novell internal Mail app, and a Btrieve database was a shared Customer Notes application. Basically, it was a just a simple text storage database, that anybody who handled any kind of customer call used to make a quick summary note of the call, that could then be searched by customer name, date, contact name, employee ID, or free form text input. In the days before big ticket CRM systems, it was a big winner, because it could answer questions like "I talked to somebody about this, 2 or 3 days ago, but I didn't get their name, and I forgot what they said to do about X. Can you help me?"

Our internal name for it became "Lifesaver."

SOAP::Lite.