count of element in XPath

Question

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Answer 1

If you are using XPath from an environment such as Java or C#, you should first bind a prefix to the namespace, which depends on the API you are using, but will be something like

xpath.declareNamespace("f", "mynamespace")

and then evaluate the XPath expression

count(element/f:Element1)

I deliberately chose a different prefix from the one in your source document just to show that you can use any prefix you like, but of course your code is more readable if you are consistent in your choice of prefixes.