The question mark (?) and ampersand (&) separate the terms in a REST request. The first term in the request must always be the endpoint, which, in the preceding example, is,http://ecs.amazonaws.com/onca/xml. A question mark always follows the endpoint. The question mark tells the Product Advertising API web servers to start parsing the request for parameters.
Ampersands separate all of the other parameter name-value pairs in the request. The order of the parameter name-value pairs is inconsequential, as long as they all occur after the question mark.
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