Hi Denghui,

this container is used only for augmentation purposes. In order to augment structures you have to specify a path to the structure you want to augment. This way we can use "/oxm:oxm-container/oxm:match-entries" path, otherwise we would have to use match augmentations for all places, where the match is used (because of different paths). So instead of having 24 augmentations, we would have like 7 * 24 augmentations. Similarly, you can find same container usage in actions and instructions.

Regards

Michal Polkorab

---

From: denghui huang <huangdenghui@...>
Sent: 22 May 2014 17:35
To: openflowjava-dev@...
Subject: [openflowjava-dev] Question about container statement of openflow-extensible-match.yang file.

 

Hi all
  

    Recently, i read OpenFlow yang model file, when i read openflow-extensible-match.yang file, there is one section which use container statement, like the following:
   
      .....
      container oxm-container {
            uses oxm-fields;
        }

      .....

     RFC says:

   The "container" statement is used to define an interior data node in
   the schema tree.  It takes one argument, which is an identifier,
   followed by a block of substatements that holds detailed container
   information.

   A container node does not have a value, but it has a list of child
   nodes in the data tree.  The child nodes are defined in the
   container's substatements.

  So the upper yang section means that it defines a interior data node in the scheme tree named oxm-container, and it has child node from grouping oxm-fields,

  I can understand that. but when i check the generated java interface OxmContainer, seems that there is no reference in code base. So, my question is why we need to define

it?

--denghui

MichalPolkoráb

Software Developer

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