public IEnumerable <ITagSpan <ClassificationTag> > GetTags(NormalizedSnapshotSpanCollection spans)
{
return((
from span in spans.AsEnumerable()
from mappingTag in _aggregator.GetTags(span)
where IsCommentSpan(mappingTag)
let normalizedSnapshotSpans = mappingTag.Span.GetSpans(span.Snapshot)
from tagSpan in GetTagSpansFromSnapshotSpans(normalizedSnapshotSpans)
select tagSpan
).ToList());
}