PDME — PDM Enablers file locking behavior

Summary: The PDM Enablers convenience document mfg/98-02-02, section 2.6.1,
"PdmDocumentManagement Overview," explains checkin/checkout as follows:

To perform a checkout, the client would first lock the file using the
lock() operation. The client then transfers the file"s contents from
the PDM server to it"s file system. To perform a checkin, the client
creates a new DocumentIteration. It then creates a new File,
associates it with the DocumentIteration, transfers the contents of the
file from the client to the PDM server. Lastly, it unlocks the file.

If every checkin creates a new DocumentIteration, then it follows that I
would never actually change a File once it has been uploaded, because that
would be an untracked change, and untracked changes are always bad and
evil. So I don"t know why I"d ever need to lock a File.

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