I wonder whether, in XSLT 3 with (the option of) streaming, a function
or template can check/introspect if it is dealing with a streamed node
or a grounded node.

For instance, depending on how an XSLT stylesheet is executed the
initial match selection might be streamed (e.g. StreamSource in
Java/Saxon API) or grounded (XdmNode in Java/Saxon API), can the
stylesheet code check whether it is dealing with a streamed or with a
grounded node?