The equipment ID is a SEC node property, and it is therefore redundant to put it as the second item of the describe message.
However as the describe/describing message might be extended later, for example to get the description of single modules only, we should specify a fixed word for the second item of the describe message, for example the keyword "ALL" or "All".
At the meeting in Berlin (2017-05-30) this was discussed, but it was not yet decided the the keyword should be exactly. Until a final decision, SECoP clients should ignore the second item.
We should use key keyword ALL (Markus Zolliker)
The decision was taken to use a bare period as placeholder:
..code:
describing . {"modules": ...