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| Defined by the domain of interoperability of [[pair product|mutual competing implementations]]:
| | #redirect [[pair product]] |
| * always more than one [[prototype]];
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| * customer/consumer may always select alternative vendor.
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| Also characterized by
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| * customer/consumer imposed interoperability constraints: eg: ''Valid proposals must name 2 independent vendors + availability + pricing, whose product(s) meets the product specification.''
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