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What does this mean?
Parent, Children and Cascade deletions
"Children" elements are elements that directly depend on another object (the "parent").
They only have sense in a certain context, and if the context to which they belong is removed, to mantain data meaning and integrity the application provides also the removal of them (now become "orphans").
Example
Take the case of a Travel and of the Events occurred during it.
In this example, deleting a Travel will leave all of its Events meaningless since, taken alone, they would have no context in which to place themselves, nor a way to reach them.
Consequently, the removal of a Travel also causes the elimination - cascading - of all Events that occurred in that Trip.
Important
Note that this operation is not limited to one level of relationship, but proceeds with children of deleted children and so on, until the entire database is freed from unnecessary data.
This lets the user remove all data about a Travel by simply deleting that Travel.
Georg Forster tells of the hospitality shown to him and to other travellers by the native people. Returning from one of their excursions, they are greeted by a native family, some of whom play and sing for them.
Text on source
One of the young men had a flute made of a bamboo, which had but three holes; he blew it with his nostrils, whilst another accompanied him with the voice. The whole music, both vocal and instrumental, consisted of three or four notes, which were between half and quarter notes, being neither whole tones nor semi-tones. The effect of these notes, without variety or order, was only a kind of drowsy hum, which could not indeed hurt the ear by its discordant sounds, but made no pleasing impression on our minds. It is surprising that the taste for music should be so general all over the world, when the ideas of harmony among different nations are so distinct!
English translation
Folios/Pages
pp. 291-292
Date
1773 08 21
Observations on the events description
Of particular interest are Georg Forster's comments on the difference in musical tastes between the Europeans and the Polynesians.
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.