Example cont.’d (a publication / an event instance)

• a set of topics

• a set of (attribute, value) pairs including

  • all mandatory attributes for the topics
  • (possibly) optional attributes for the topics.

Topics: generic_auction, antiques,

Set of (attribute,values): (price, 9000), (auction_category, table),

(description, {“oak”, “dinning table”},

(period, 1800), (style, Louis XV).

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