TreeInfo from Source?

Hi,

I want to use the "Preloading shared reference documents" feature with
Saxon-HE 10.1:
http://saxonica.com/html/documentation/sourcedocs/preloading.html

More specifically, call config.getGlobalDocumentPool().add(doc, uri)
in order to avoid resolving the same document URIs again and again
during multiple transformations.

Looking at the add() method I see it accepts a TreeInfo. Our code is
operating on Sources. Although TreeInfo extends Source, I cannot find
how it is constructed from one. None of the wrapper classes accept it.
Where should I look?

That is how we currently build Source instances:

        try (ByteArrayOutputStream stream = new ByteArrayOutputStream())
        {
            model.write(stream);
            return new StreamSource(new
ByteArrayInputStream(stream.toByteArray()), systemId);
        }


Martynas