WESTERN EUROPEANS URGE ROLE FOR P.L.O. IN MIDEAST PARLEYS; FACT-FINDING MISSION URGED Venice Declaration Is Expected to Receive Approval Today From Common Market Leaders Friction Over Mention of P.L.O. Common Market Officials Call for a Direct P.L.O. Role in Mideast Talks 'Relaxed' and 'Reflective' Mrs. Thatcher Is Central Figure Another Meeting in 10 Days No Comment by State Department
VENICE, June 12 West European foreign ministers reached substantial agreement tonight on the text of a declaration calling specifically for the Palestine Liberation Organization to take part in future Middle East peace negotiations.

