Redline markup in DOORS

The comparison that generates redline markup in IBM® Engineering Requirements Management DOORS® (DOORS) is made on a word by word basis between two static pieces of text. A longest common subsequence algorithm is used. DOORS does not save information about individual keystrokes, so the redline markup might not reflect the sequence of changes performed by the user.

For example, if DOORS compares ship wreck to shipwreck, the redline markup shows ship as deleted, wreck as deleted and shipwreck as inserted.

DOORS uses word level analysis rather than character level analysis for performance reasons.


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