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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.
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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 describes another musical encounter with the natives. This time they have the opportunity to hear a song from the island of Irromanga, near Tanna, because the man they have asked to sing is from there. Forster notes the difference from what he had heard that morning (see also event number 110).
Text on source
We were no sooner seated with the father of one of the families, a middle-aged man, of a promising countenance, than our friends importuned us to sing to them again. We readily complied with their request, and when they seemed to wonder at the difference in our songs, we endeavored to make them understand that we were natives of different countries. Hearing this, they pointed at an elderly thin man in the circle of our hearers, and telling us that he was a native of Irromanga, desired him to sing to us. The man immediately stepped forward, and began a song, in the course of which he made a variety of gesticulations, not only to our entertainment, but to the great satisfaction of all the people about him. His song was to the full as musical as that of the people of Tanna, but it seemed to be of a droll or humorous nature, from his various ludicrous postures, and from the particular tone of the whole. The language was utterly distinct from that of Tanna, but not harsh or ill-suited to music. It seemed likewise to have a certain metre, but very different from that slow and serious one which we heard this morning.
English translation
Folios/Pages
p. 322
Date
1774 08 13
Observations on the events description
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.