The 17 members of the Screen Actors Guild's negotiating committee metWednesday with federal mediator Juan Carlos Gonzalez, but trade reportsindicated that little of substance was discussed. Daily Variety ,citing people close to the situation, said that the meeting was brief andwas intended to introduce the committee to Gonzalez. Last month Gonzalez hadhis first meeting with SAG President Alan Rosenberg, National ExecutiveDirector Doug Allen, and contracts chief Ray Rodriguez. The Alliance ofMotion Picture and Television Producers met with Gonzalez on Oct. 30. .