'Virtual' subtree

[Simon Zhong <szhong.jnpr () gmail com>]

Hi,
I'm working on PCEP dissector, I'm wonder if it's possible to create a
'virtual' subtree.
The format of a message is as follows:
<PCReq Message>::= <Common Header>
                  [<svec-list>]
                  <request-list>
where: <svec-list>::=<SVEC>[<svec-list>]
      <request-list>::=<request>[<request-list>]
      <request>::= <RP>
                   <END-POINTS>
                   [<LSPA>]
                   [<BANDWIDTH>]
                   [<metric-list>]
                   [<RRO>[<BANDWIDTH>]]
                   [<IRO>]
                   [<LOAD-BALANCING>]
...
As you can see there's no real field called <svec-list> or <request-list>,
it's just set of some other real fields. But I believe it will be more
clear if we can present these real fields under a 'virtual' subtree,
instead of presenting them flatly.
Is there any way to do this? Thanks.
/Simon

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