[BioC] graphite biopax conversion code?

[Ryan C. Thompson]

Hello,

I am a happy user of the graphite package, but I would like to have the 
capability to use additional pathways not provided in the graphite 
package. I have these pathways in BioPAX format (downloaded from 
WikiPathways). I notice that the graphite paper talks about conversion 
BioPAX to SIF, but the package does not seem to provide a method to do 
the conversion, but rather simply provides the results of that 
conversion on several common sources of pathway data. Would it also be 
possible to include the conversion code, so that I could use any BioPAX 
pathway data that I choose with graphite?

Thanks,

-Ryan Thompson