Trading Session Status for specified securities

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Imported from previous forum

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We have a market in which different securities may have different Trading Sessions. There is a default session for the market as a whole, and a number of different sessions for specified securities. The former applies to all securities not explicitly over-ridden.

The FIX spec (v4.2, page 78) says:
"The Trading Session Status can provide an optional repeating group of securities that are available for trading during the session". However, the message table does not specify this explicitly.

Questions:

  1. Is this repeating group the same as fields
    #146 NoRelatedSym
    #311 UnderlyingSymbol
    etc.
    from SecurityDefinitionRequest (this is implied by a comment on page 77)?

  2. Is it valid to use a Trading Session Status message without explicit Symbols for the market default session?

My working assumption is yes to both.