Further subscription language design options

• notions of time (points, intervals)

• operators on time (before, after, ...)

• changes (% increase, decrease, )

• location of objects

• movement of objects

• introduce fuzziness (“close”, “about”, ...)

{2 BR, close VI arr., price about 6000 FF}

expressiveness of sub. language vs. processing

complexity of matching (cf. part III)

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