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Re: Find the number of elements that are prior to the

Subject: Re: Find the number of elements that are prior to the series of elements that match a string?
From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 12 Mar 2019 19:53:22 -0000
Re:  Find the number of elements that are prior to the
On 12.03.2019 18:35, Costello, Roger L. costello@xxxxxxxxx wrote:

I have an XML document containing a long list of Byte elements, e.g.,

I have a string of hex values, e.g.,


You can see that the string is contained within this series of Byte elements:

What is an efficient way to solve this problem?

I think it can be done in XQuery 3 with a windowing clause, I am not sure whether you need a sliding or a tumbling window but along the lines of

let $req := '04000000FF'
let $len := string-length($req)
        for sliding window $w in /Bytes/Byte
        start $b1 at $s when $b1 = substring($req, 1, 2)
        end at $e when $e - $s + 1 = $len idiv 2
        where string-join($w) eq $req
        return $s - 1

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