select all co-authors based on one author

[Ján Mojžiš]

Hi all,
I have a following problem:
I want to select a name from graph, which is composed as:
- title
- date
- person name 1
- person name 2
...

There more than one person in graph - co-authors. I want to select based on
person name, so I'd try
Select ?name ?title {
   ?x foaf:person "somename".   # one author
   ?x foaf:person ?name.
   ?x dc:title ?title
}

How to select co-authors based on one author? (co-authors are in the same
position in graph as "somename")

Thanx.
Have a nice day
Jan