--- title: MarketDefinitionRequest message – FIX 5.0 SP2 – FIX Dictionary – Onix Solutions description: MarketDefinitionRequest message – FIX 5.0 SP2 – FIX Dictionary – Onix Solutions --- ![Dictionary icon](https://www.onixs.biz/hubfs/SIC_website_2020/images/interface/img-icon-book.svg) # MarketDefinitionRequest message – FIX 5.0 SP2 – FIX Dictionary | Messages by MsgType \| Messages by Name \| Fields by Tag \| Fields by Name \| FIX 5.0 SP2 \| Home FIX 5.0 SP2 : MarketDefinitionRequest message Structure \| Related Messages Description The Market Definition Request message is used to request for market structure information from the Respondent that receives this request. Fields that are specified will act as "filters" for the request. For example, if MarketID is specified then only market structure information for that specified market should be sent back if available. If MarketID is not specified then the request is for all available market structure information. The Market Definition Request can also indicate to the Respondent whether the request is for a snapshot of requested information, subscribe to market structure information, or to unsubscribe to an earlier subsription request. This is done via the SubscriptionRequestType (263) field. Structure Tag Field Name Req'd Comments Component Block - Y MsgType = BT 1393 MarketReqID Y Must be unique, or the ID of previous Market Segment Request to disable if SubscriptionRequestType = Disable previous Snapshot + Updates Request(2). 263 SubscriptionRequestType Y 1301 MarketID N Conditionally required if MarketSegmentID(1300) is specified on the request 1300 MarketSegmentID N 1325 ParentMktSegmID N Specifies that the Market Segment is a sub segment of the Market Segment defined in this field. Component Block - Y Related Messages | | --- | | ![](https://www.onixs.biz/fix-dictionary/img/spacer.gif?height=5&name=spacer.gif) | - Follow OnixS - [Follow us on Twitter ](https://twitter.com/onixsbiz) - [Connect with us on LinkedIn ](https://www.linkedin.com/company/onix-solutions/) We track how people interact with our online web content and resources, and some of that tracking involves storing cookies on your device. By continuing to use our site you accept that you agree to this. For more details see our [Cookie usage, and Data Privacy and Protection Policies](https://www.onixs.biz/cookies-and-privacy.html). [Ok](https://www.onixs.biz/fix-dictionary/5.0.sp2/msgtype_bt_6684.html#) [OnixS ](https://www.onixs.biz/) Menu --- --- [OnixS ](https://www.onixs.biz/) ### Search the site Search