Alex, OpenOffice::UNO is a straight bridge to the OpenOffice.org API, so the definitve reference is in the OpenOffice.org SDK.

You have to read http://api.openoffice.org/

http://wiki.services.openoffice.org/wiki/Uno

http://codesnippets.services.openoffice.org/Writer/Writer.StoreWriterAsPDF.snip

sUrl="file:///myhome/documents/source.sxw"
oDocument=oDesktop.loadComponentFromURL(sUrl,"_blank",0,DimArray())

Dim args(0) as new com.sun.star.beans.PropertyValue
args(0).Name = "FilterName"
args(0).Value = "writer_pdf_Export"
destination = "file:///myhome/documents/test.pdf"
odocument.storeToURL(destination,args())

oDocument.close(true)
[download]

grep writer_pdf_Export -r OpenOffice-UNO-0.06

http://cpansearch.perl.org/src/MBARBON/OpenOffice-UNO-0.06/t/14.t

http://perluno.cvs.sourceforge.net/viewvc/perluno/perluno/examples/DocumentSaver/

http://perluno.cvs.sourceforge.net/viewvc/perluno/perluno/examples/DocumentConverter/