Which execution algorithm should be used for a rule task with rule chaining?

A company wants to use ODM rules for a graphical user interface (GUI) validation. They want to use rules to validate forms filled out by customers. The rules would validate user input and answers to the questions. The users must have the ability to navigate the website while waiting for the ODM response. What implementation should they use?

A company wants to implement a business rules solution for warranty claims on their widgets. The customer requires that servers should not store any information about the context of clients between calls and must have a strict enforcement of objects, rules and constraints. The implementation must support complex operations and synchronous calls. Integration with other services must be platform independent. What implementation best fits the customers requirements?