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The QuickFIX/J DataDictionary contains information about supported FIX messages and fields. This is sometimes called message metadata. QuickFIX/J uses this information for parsing, formatting, and validating messages. However it has other potential uses as well. For example, you could write a simple message formatter that uses DataDictionaryinformation to print human-friendly representations of FIX messages. In this article we'll develop a message formatter as an example of using QuickFIX/J metadata.
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