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RAMBOUILLET, France (CNN) -- Negotiators meeting in France plan to start detailed discussions Monday on a peace plan for the troubled Serbian province of Kosovo.

On Sunday, Serb and ethnic Albanian representatives agreed to a framework of 10 basic principles presented by the six-nation Contact Group on the Balkans. The principles grant the embattled province a certain amount of autonomy while keeping it part of Serbia for another three years.

"We expect tomorrow (Monday) to begin the substantive, line by line discussions," said conference spokesman Phil Reeker.

International mediators characterized Sunday's talks as positive, but warned that discussing the details of the agreement would be much tougher.

"It's a good step forward," said one Western mediator after Sunday's talks. "But the devil is in the details."

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There is likely to be less agreement on those details. One member of the Serb delegation, who demanded anonymity, said some of the details of the Contact Group plan are "horrifying for us because it would take Serbia out of Kosovo completely."

The delegate said Serbia is preparing a list of proposed amendments.

The hard-line Kosovo Liberation Army has said it would not accept anything short of full independence for Kosovo. But acceptance of the Contact Group's proposal would mean giving up on that idea, at least for the three-year interim period.

Referendum after three years?

The Ethnic Albanian newspaper Koha Ditore quoted Albanian sources as saying their delegation has demanded a referendum on Kosovo's status after the three years.

Kosovo is 90 percent ethnic Albanian, and a majority of that group wants to secede from Yugoslavia.

Serbs and Ethnic Albanians have not yet met face to face. The international mediators, led by U.S. envoy Christopher Hill, Austrian Wolfgang Petritsch and Russian diplomat Boris Mayorski, shuttled between the delegations at a chateau in Rambouillet, about 30 miles (50 km) south of the French capital.

The two sides came to France to discuss peace for Kosovo under threat of NATO airstrikes.

The conflict has been brewing for a decade, since Kosovo's provincial autonomy was revoked in 1989. But it erupted last February when Serb police began a crackdown on separatist ethnic Albanians.

The Associated Press and Reuters contributed to this report.

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