For the most part, MarketMaker data from LSEG Real-Time Distribution System is the same as it is from the original source of the data (e.g., Data Feed Direct). However, if caching is enabled in an LSEG Real-Time Distribution System component, there will be two differences.
The number of messages packed into each Refresh response message may be different.
An Update response message may be delivered between Refresh response messages, before RefreshMsg.Complete is sent with a true value. It is up to the consumer application to apply the indicated changes.
Code Example 6: Market Maker Request Message Sample XML Message Layout