# Query Type: 7, Cross-delta structured queries (queries performed on changes of several versions (multiple deltas)) # Query Description : # Retrieve the average number of added News Items from version Vi to version Vi+2. PREFIX cwork: SELECT ((?ViPlus1_news_items_added + ?ViPlus2_news_items_added) / 2 AS ?avg_added_news_items) WHERE { { SELECT (COUNT(*) AS ?ViPlus1_news_items_added ) WHERE { GRAPH { ?creativeWork a cwork:NewsItem } MINUS { GRAPH { ?creativeWork a cwork:NewsItem } } } } . { SELECT (COUNT(*) AS ?ViPlus2_news_items_added) WHERE { GRAPH { ?creativeWork a cwork:NewsItem } MINUS { GRAPH { ?creativeWork a cwork:NewsItem } } } } . }