dom - Does a PHP supports recursively processing of xi:include elements?

Solution:

The only thing I can find missing is that you have to make sure that in both the index.xml and the sitemap.xml, you need to have the xi namespace declared in the document, so with

index.xml

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:xi="http://www.w3.org/2001/XInclude">
    <url>
        <loc>/privacy/</loc>
        <query>/?template=home&amp;content=home</query>
    </url>
    <xi:include href="legal/sitemap.xml" xpointer="xpointer(//urlset/*)"/>
</urlset>
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sitemap.xml

<urlset xmlns:xi="http://www.w3.org/2001/XInclude">
    <url>
        <loc>/cookies/</loc>
        <query>/?template=page&amp;content=cookies</query>
        <lastmod><xi:include href="cookies.xml" xpointer="xpointer(//*[1]/datePublished/text())"/></lastmod>
    </url>
</urlset>
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cookies.xml

<?xml version="1.0" encoding="UTF-8"?>
<section xml:id="php" class="page">
    <title>Cookies</title>
    <datePublished>2018-11-28T12:02:41Z</datePublished>
</section>
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and the code...

$xml = new DOMDocument();
$xml->load("index.xml");
$xml->xinclude();
echo $xml->saveXML();
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you end up with

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:xi="http://www.w3.org/2001/XInclude">
    <url>
        <loc>/privacy/</loc>
        <query>/?template=home&amp;content=home</query>
    </url>
    <url xmlns:xi="http://www.w3.org/2001/XInclude" xml:base="legal/sitemap.xml">
        <loc>/cookies/</loc>
        <query>/?template=page&amp;content=cookies</query>
        <lastmod>2018-11-28T12:02:41Z</lastmod>
    </url>
</urlset>
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