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- Some discussion of XPath and a recommendation of a book that expands on this information.?
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Blind XPath Injection
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XPath tutorial - basics
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You want to test for the presence of one or more of several values. If found you want the found value returned.
Note: this expression works when you expect only a single value to return. If the user has more than one value that matches you end up with a concatenated string.
How do we fix that? If you set another nodeset variable equal to the xpath expression and remove the trailing text element then you will get the nodes that match and can iterate through them or handle them as you please.
Xpath Kick Start : Navigating XML with Xpath and - biputoduhu.gq
There are several approaches to handle that. This example inserts a remove-all-values element into a modify of an existing attribute. This would be used to ensure that a SET destination attribute action always takes place instead of an add destination attribute.
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The following rule would test to ensure that Surname is present and that it doesn't already contain a remove all values element:. Reformat actually replaces all the existing values for the attributes with new ones. In that sense it is much more broad than the XPath approach because it actually throws away the original value elements and replaces it with a newly fabricated one that will only have on it exactly what you specify to put on it. This rule will grab the value of a single component of a structured attribute using the component's name.