i am not sure if this should be in an XSLT forum or an XSLT-FO.

I have an xml document that would look something like this
<invoice>
            <doc>
                        <number>100001</number>
                        <details> blah blah blah </details>
            </doc>
<doc>
                        <number>100002</number>
                        <details> blah blah blah </details>
            </doc>
<doc>
                        <number>100003</number>
                        <details> blah blah blah </details>
            </doc>
</invoice>

I want to export each document to a separate pdf, eg 100001.pdf, 100002.pdf , 100003.pdf. Is this possible if so how?

if someone could point me in the right direction i would be grateful.

XSLT 2.0 allows multiple output files using the <xsl:result-document> instruction.

Some XSLT 1.0 processors have similar facilities as a vendor extension. Failing that, you can sometimes do-it-yourself using calls to Javascript or whatever.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

is there anywhere online that details this? this sounds ideal.

http://www.w3.org/TR/xslt20/#creating-result-trees

Clearly, if you're planning to put each of the XSLT result documents through an FO processor to create PDF, then you're going to have to organize the workflow in some way. If you're using Saxon then you could write an OutputURIResolver that intercepts each result tree as it is written and passes it to an XSL-FO processor.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference