is.seqelist can be used to check for list of internal object.
as.seqelist can be used to set a list as list of internal sequence object.
There is a print method to handle this kind of object.is.seqe(s)
is.seqelist(s)str.seqelist, str.seqe,as.character.seqelist and as.character.seqe to get character string of event object