Saxon » SaxonC

https://www.saxonica.com/saxon-c/doc12/html/saxonc.html#PyXPathProcessor-set_property says:

set_property(...)
set_property(self, name, value)
Set a property specific to the processor in use.
Args:
    name (str): The name of the property
    value (str): The value of the property
Example:
    PyXPathProcessor: set serialization properties (names start with '!' i.e. name "!method" -> "xml")
    'resources': directory to find Saxon data files,
    's': source as file name,
    'extc': Register native library to be used with extension functions

So to me "PyXPathProcessor: set serialization properties (names start with '!' i.e. name "!method" -> "xml")" suggests PyXPathProcessor does allow setting serialization properties to be applied when serializing XPath evaluation (results).

But is there any method where I can evaluate an XPath expression and serialize the result to a string? I only find https://www.saxonica.com/saxon-c/doc12/html/saxonc.html#PyXPathProcessor-evaluate and https://www.saxonica.com/saxon-c/doc12/html/saxonc.html#PyXPathProcessor-evaluate_single which return a PyXdmValue or a PyXdmItem but do not serialize to a file or string.

So why does the documentation of set_property mention serialization properties, how/when would they be applied if set?