From Xinhua News Agency (in Chinese), translated by CDT (link):
A document released by the State Council, China’s cabinet, stresses that the absence of migrant workers who work in cities is not an excuse to seize their contracted land. While the migrant workers are away from their homes, the document says, they can sublet or transfer the usage rights of their land, and the land shouldn’t be left unfarmed. The transfer of land usage should be practiced on the legal, voluntary and compensated basis. No organization or individual shall force, restrict or seize the benefits of land transfers, the document emphasizes.
