U.S. and Chinese negotiators are working on multiple memorandums of understanding that would form the basis of a final trade deal, according to a person briefed on the talks.

The MoUs would cover areas including agriculture, non-tariff barriers, services, technology transfer and intellectual property, said the person, who asked not to be identified because the discussions are private. The enforcement mechanism remains unclear, but would likely be a threat that tariffs would be reimposed if conditions aren’t met, the person said.

No breakthrough is expected during this week’s talks in Washington on major structural issues, the person said, but there is an effort underway to potentially extend a March 1 deadline for U.S. tariffs to rise on Chinese goods. Liu He, China’s chief negotiator, is expected to meet with U.S. President Donald Trump on Friday, according to a separate person familiar with the situation.

A spokesman for the U.S. Trade Representative didn’t immediately respond to a request for comment. China’s commerce ministry didn’t immediately reply to faxed questions.

Reuters earlier reported that U.S. and Chinese officials were discussing language on six memorandums of understanding that would resolve the trade war’s most contentious issues.