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I will send another email to NETMOD mailing list too. > At the same time, I also add an example to explain why the augmentation is a heavy burden for the orchestrator. > > If a orchestrator needs to coordinate multiple domain controllers who all have their owned extensions, and the source standard YANG data structure is very complex. > Because that all the vendors can their owned extensions in any places, from orchestrator’s view, the overall data structure can look like: > { > "ietf-example:root”: { > "attr-1”: a, > "attr-2”: b, > "attr-3”: c, > "vendor-a-ext:attr-4”: d, > "vendor-b-ext:attr-5": e, > "containter-1": { > "attr-6”: f, > "attr-7”: g, > "attr-8”: h, > "vendor-a-ext:attr-9”: i, > "vendor-c-ext:attr-10": j, > "vendor-d-ext:list-11”: [{ > "attr-12”: k, > "attr-13”: l > }], > "list-14": [{ > "attr-15”: m, > "attr-16”: n, > "attr-17”: o, > "vendor-a-ext:attr-18”: p, > "vendor-c-ext:container-19”: { > "attr-20”: q, > "attr-21”: r > } > }] > } > } > } > Please note that the attributes start with vendor-*-ext are extended by different vendors. > We can see that, the extensions can be happened at any places with any format or structures. The orchestrator need to do a lot of judgement and adaption for these extension. There are many ways to filter effectively in YANG. The 'judgement' part does not change if you force hierarchical data into a flat list. It is a feature that YANG allows augmentations at the place in the hierarchy where it makes the most sense. /js -- Jürgen Schönwälder Constructor University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103