[Context and motivation] Software Requirement Patterns (SRP) are a type of artifact that may be used during requirements elicitation that also impact positively in other activities like documentation and validation. In our experiences, SRP show a great percentage of reuse for the non-functional requirements needed in call-fbr-tender requirement specifications. [Question/problem] We are facing the need of formulating the accurate definition of SRP for their use in call-for-tender processes to allow reasoning rigorously and know more about their semantics and applicability. [Principal ideas/results] In this paper we present a metamodel for SRP around three main concepts: 1) the structure of SRP themselves; 2) the relationships among them; 3) the classification criteria for grouping them. [Contribution] We provide a rigorous definition that shows the concepts that are of interest when defining and applying SRP.
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