In the paragraph after Table 4.4, there is a diagram with graph patterns illustrating query rewritting like so:
?x–type➛Event ∪ ?x–type➛Type ∪ ?x–type➛Periodic Market ∪ ?x–venue➛?y
After the first union symbol, the pattern should be ?x–type➛Festival.
In the paragraph after Table 4.4, there is a diagram with graph patterns illustrating query rewritting like so:
After the first union symbol, the pattern should be ?x–type➛Festival.