| 31. | Currently the standard has catalogued the most important components and data items for metal cutting devices.
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| 32. | The first rule ensures that a data item is not read and written by two transactions concurrently.
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| 33. | Lucid is based on an algebra of histories, a history being an infinite sequence of data items.
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| 34. | They keep track of the location of data items in the stream in any way they want.
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| 35. | Considering data events as relevant data item state transitions allows defining complex event-reaction schemata for a database.
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| 36. | Each pointer is bound to a single dynamic data item, and can only be moved by assignment:
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| 37. | Each data item has a tag.
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| 38. | The names,, and are ambiguous by themselves, since more than one data item is defined with those names.
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| 39. | Any duplicated data items are discarded.
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| 40. | In complicated applications of statistics, there may be several ways in which the number of data items may grow.
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