Wildcards in Market Data Subscriptions

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Imported from previous forum

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[ original email was from Bernt Sandén - bernt.sanden@om.com ]
All,

When subscribing for market data I would like to subscribe for all instruments for the exchange or for all instruments for a specific trading session at the exchange instead of setting up thousands of subscriptions.

Is there any value that could be placed in the symbol field (tag 55) to indicate “all instruments”?

Thanks in advance,

Bernt