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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.
Askya (King) Muhammad Bonkana is credited for the invention of two musical instruments: a trumpet called "fotorifo" and a drum called "gabtanda". The exact form of the two instruments is unknown.
Text on source
واول من مشى بالدفوف في السفينة وهو الذي اخترع فُتُرِفُ وكَبْتَنْدَ آلتي اللهو وفترف بفاء مضمومة بعدها تاء مضمومة فراء مكسورة ففاء مضمومة يشبه البوق وكبتند وهو كالطبل الا ان صوت الطبل ارفع منه وهما معروفان عندهم ولم يكن فترف الَّا لسلطان أَيَر [ص. ٨٤]
English translation
He was also the first who ordered drums [dufūf] to accompany his voyages by pirogue. It was he who actually invented the musical instruments of the "fotorifo" [futurifu] and the "gabtanda" [kabtanda]: the "fotorifo" is like a trumpet and the "gabtanda" is a sort of drum, but one that sounds more somber than ordinary drums. These two instruments were known in his country, but in former times the king of the Ayar was the only one who possessed the "fotorifo".
Folios/Pages
156
Date
1531 circa
Observations on the events description
The trumpet called "fotorifo" is said to be already known by the people of Ayar, which is presumably Aïr/Agades.
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.