Programmable interface - machine-readable output

[jkowalleck]

I would like to call the tool from another process and parse the output.
Here are my requirements:

• only machine-readable output on STDOUT
• no unexpected output on STDOUT (logs and debut and others are sent to STDERR)
• on success: zero(0) exit code
• on failure: non-zero (>1) exit code

machine readable could be XML, JSON, ProtoBuff, predefined string patterns, whatsoever.