The <scanCoverage> tag indicates whether the index scan for the query plan is “Covered” or “NonCovered”.
For more information on covered index scans, see “Indexes” in the Performance and Tuning Series: Locking and Concurrency Control.
select show_cached_plan_in_xml(1139220075, 0)
<text> <![CDATA[ SQL Text: select * from sysobjects group by name]]> </text> <IndexScan> <VA>0</VA> ... <scanCoverage> NonCovered </scanCoverage> ... </IndexScan>