# 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 } } }
} . }