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Building a string from an xml

Last Modified: 2016-06-07

Can someone help me with some sql that will return to me some data from an xml object?

I have the following xml:

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I would like to extract the text of the <Value> nodes under the <root> <Filters> <Filter><Values> where the text in <root> <Filters> <Filter><Name> is "diagnose".

The resuting nvarchar should be "1461, 1462"

I am used to building strings like this from tables using something like:
 select @CategoryAxis = @CategoryAxis + '<Category>' +cast( measurementdate as nvarchar(12) ) + '</Category> ' from MeasurementStatisticsPerUnit

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but i just cannot get my head arround XML.
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