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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<link href="doxygen.css" rel="stylesheet" type="text/css">
<title>Validation</title>
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<div class='header'>
<div class='headertitle'>
Validation
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<div class='contents'>
<p>QuickFIX will validate and reject any poorly formed messages
before they can reach your application. An XML file defines
what messages, fields, and values a session supports.</p>
<p>Several standard files are in included in the <b>spec</b>
directory.</p>
<p>The skeleton of a definition file looks like this.</p>
<pre class='fragment'>
<fix type="FIX" major="4" minor="1">
<header>
<field name="BeginString" required="Y"/>
...
</header>
<trailer>
<field name="CheckSum" required="Y"/>
...
</trailer>
<messages>
<message name="Heartbeat" msgtype="0" msgcat="admin">
<field name="TestReqID" required="N"/>
</message>
...
<message name="NewOrderSingle" msgtype="D" msgcat="app">
<field name="ClOrdID" required="Y"/>
...
</message>
...
</messages>
<fields>
<field number="1" name="Account" type="CHAR" />
...
<field number="4" name="AdvSide" type="CHAR">
<value enum="B" description="BUY" />
<value enum="S" description="SELL" />
<value enum="X" description="CROSS" />
<value enum="T" description="TRADE" />
</field>
...
</fields>
</fix>
</pre>
<p>The validator will not reject conditionally required fields
because the rules for them are not clearly defined. Using a
conditionally required field that is not preset will cause a
message to be rejected.</p>
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