The best information I can find on what values Xalan accepts is:

The setParameter() method provides a value for a parameter that overrides any
value used in the stylesheet itself. The processor is responsible for
converting the Java object type passed to a reasonable XSLT equivalent. This
should work well enough for String, Integer, Double, and Boolean as well as
DOM types like Node and NodeList. However, I wouldnbt rely on it for
anything more complex like aFile or a  Frame.

which was written by one Elliotte Rusty Harold in 2003 (*). If you find
anything more informative, please let us know.

Michael Kay
Saxonica

(*) https://www.ibiblio.org/xml/slides/oop2003/xmlandjava/416.html


> On 17 Feb 2017, at 13:54, Elliotte Rusty Harold elharo@xxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Baseline:
>
> * Java 7
> * Bundled version of Xalan
> * java.xml.transformers.Transformer
> * DOM
>
> I want to create and pass a set of elements from Java into the model
> where the stylesheet can add them to my output.
>
> Is this possible? In particular, is there a type I can use from Java
> such as NodeIterator that this particular processor will recognize as
> a node-set and assign to a variable inside the stylesheet?
>
> Or should I simply do all the manipulation in DOM? (I'm trying to keep
> my dependencies to a minimum so I don't want to pull in Saxon, etc.)
>
> --
> Elliotte Rusty Harold
> elharo@xxxxxxxxxxx