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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.
The natives are convinced to board the ship and on the morning of April 19 the man and the younger woman appear on the shore. Georg Forster describes the ritual performed by the man before boarding.
Text on source
He then began to repeat a kind of speech or prayer, which seemed to have regular cadences, and to be metrically arranged as a poem; his eyes were fixed upon the place he had touched, his voice was raised, and his whole behaviour grave and solemn. The young woman, though at other times laughing and dancing, now kept close to the man and was serious all the while he spoke, which
lasted about two or three minutes; at the close of his speech he struck the ship's side again, threw the branch into the main chains, and came aboard. This manner of delivering solemn orations, and making peace, is practiced by all the nations which have been seen in the South Sea before our voyage, as appears from the testimonies of various voyagers.
English translation
Folios/Pages
p. 161
Date
1773 04 19
Observations on the events description
The interesting thing is the ritual performed by the man; the woman's dancing is mentioned, contrasting with her serious attitude.
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.