What is the purpose of the <CorrelationExtractionRules> tag and the CorrelationBinding="..." attribute within the <QueryStringParameter ...> tag within a Visual Studio 2013 ".webtest" file?

The recorded web test for the web site I am testing has several requests that each have several extraction rules within the <CorrelationExtractionRules> tags. There are also many query string parameters that have CorrelationBinding="..." attributes where the ... is the same name as in a correlation extraction rule.

The web test is not working as I desire. So I have recorded additional versions of the same test to try and find the important differences and hence the identify the fault. When I use a text file compare program on these ".webtest" files there are big differences in the correlation items. Are these differences significant? Can I just ignore the correlation items?

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