---
title: "FIX 5.0 SP2 EP292: <UnderlyingSecurityXML> component block – FIX Dictionary – Onix Solutions"
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# <UnderlyingSecurityXML> component block

## FIX 5.0 SP2 EP292

### Description

 The UnderlyingSecurityXML component is used to provide a definition in an XML format for the underlying instrument.

 See "Specifying an FpML product specification from within the FIX Instrument Block" in Volume 1 of the FIX Specification for more information on using this component block with FpML as a guideline.

### Structure

| Tag | Field Name | Req'd | Comments |
| --- | --- | --- | --- |
| 1874 | [UnderlyingSecurityXMLLen](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/tagNum_1874.html) | N | Must be provided if [UnderlyingSecurityXML <1875>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/tagNum_1875.html) field is specified and must immediately precede it. |
| 1875 | [UnderlyingSecurityXML](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/tagNum_1875.html) | N |  |
| 1876 | [UnderlyingSecurityXMLSchema](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/tagNum_1876.html) | N |  |

### Used In

- [<UnderlyingInstrument>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep292/compBlock_UnderlyingInstrument.html)

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