> If you want to declare support for a PO format, say "Accept:
> application/purchase-order+xml".

Even that is insufficient to actually use the system. And the WSDL
folks have the same problem... knowing the type of information
accepted says nothing about other constraints such as what is an
acceptable purchase order for this system. Maybe only "open" purchase
orders are acceptable. Maybe only purchase orders for commodities are
acceptable.

Until our formal systems become more powerful some amount of informal
description will be necessary. The most formal descriptions that I
rely on are executable tests. They serve as examples and enumerate the
interesting successful and failure cases.

-Patrick









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