How do we create a node with with syntax <?blah ?>

[totszwai]

I am trying to generate an XML file that has the following structure:

<?xml version='1.0' encoding='UTF-8' ?>
<?charles serialisation-version='2.0' ?>
<map>
...
</map>

How could we create the second node such as <?charles serialisation-version='2.0' ?>?

[oozcitak]

That's a processing instruction node. See: https://oozcitak.github.io/xmlbuilder2/node-creation-functions.html#ins