Is it the obligation of contract or tort law?

是合同义务还是侵权法上的法定义务？

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The set of self-service deposit in supermarkets is not based on the collateral obligation of contract of sale, but the contract between consumers and supermarkets.

自助寄存柜的设置对于超市而言不是基于买卖合同的附随义务，而是与消费者之间的一种合同。

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Where one party to a contract fails to perform the obligation of contract for services or its performance fails to satisfy the terms of the contract, the party shall …

在后者的特别权力关系中，如果用人单位不按法定或约定的规定履行义务，给劳务派遣工造成实体权益的损害，须承担相应的违约责任。

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The ability to deliver the work on the part of the employer disappears because the critical difference between an ordinary employment contract and a zero hours contract is the legal concept mentioned earlier of "mutuality of obligation".

BBC: Zero hours contracts for NHS staff explained

Newmont also faced problems from the Indonesian government over increase in royalty payments, the obligation to process mineral ores in Indonesia, the use of local goods and services, divestment, contract extensions, and the size of mining areas.

FORBES: Newmont Mining's Rocky Year And The Way Forward

These negotiations are focused on six main issues: an increase in royalty payments, the obligation to process mineral ores in Indonesia, the use of local goods and services, divestment, contract extensions, and the size of mining areas.

FORBES: Newmont's Revised Production Forecast In Indonesia May Cause Labor Troubles