XSLT and function document()

Hi folks,

I have a question about the xslt function document().
What I want to do is :
    1) access to an external xml document
    2) read some data from the external xml document
    3) access to the input xml document.


Let's say we have the documents :
  - input.xml  : input document
  - style.xslt  : XSLT file
  - external.xml : external xml document


I will run the command line :


java org.apache.xalan.xslt.Process -IN input.xml -XSL style.xslt -OUT
out.xml


about 1) and 2) I know how to access to external.xml using the
function document('external.xml')
About 3) I need your help guys . I want to access to the input.xml
document but I do NOT want to call the function
document('input.xml'). Do you know if exists a parameter for the
function document() that let me know to access to the input document
avoiding an explicit call document('input.xml') ?
I hope is is enough clear my question.
Thanks,


Giovanni Leonetti