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A reference indicates the coverage of a requirement, derived requirements, or macro-requirement. For example, a reference element may interpret [Covers: reqid], where reqid is the ID of the covered requirement, as a reference.
Requirements Gateway does not display a reference as a separate element in the Coverage Analysis or Impact Analysis views but associates the reference with a preceding section or entity element. The Graphical view displays the references between requirements and covering elements as covering links.
Use a sub-regular expression when the reference information contains a reference to several requirements. For example, if the reference text contains CoveredRequirements: REQ1, REQ2, REQ3, use the regular expression CoveredRequirements: (.+), which matches the string CoveredRequirements:, a space, and any characters following it, and the sub-regular expression (REQ\d), which matches the string REQ and one following digit.