intIDs
list containing Biopax model with newly generated internal IDs
as processed with genintIDs function.
The components of the list are biopax models for "biocarta", "kegg", "nci",
"reactome". In case a database was not chosen the list
entry contains a NA.
pwdatabases
vector indicating with which pathway database the pathways
should be determined; possible choices
are "biocarta", "kegg", "nci", "reactome".