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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.
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.
6. The flautists play while the Askiya holds court
Timbuktu (Tombouctou, Tin Bukt)
Title
The flautists play while the Askiya holds court
Short description
The Askiya holds court with his intimates while the flautists play in the room.
Text on source
يكون الحاج هو القائم بعده وأمه مِنَ كاي وقيل كان يتكلِّم بكلام الكهنة ويخبر بما هي الغيب ويوافق اكثر اقواله بمقادر الله ومن ذلك انه كان في مجلس قومه وبطانته ودخلائه وغيرهم والزمِّارون يزمرون بين يديه ثم سكت طويلًا ثمِّ تنفس الصعداء ثمِّ قال يدخل علينا الآن رجل من اهل بيتنا وولد ابنينا ولا يسبقه في الدخول علينا احد وهو اشقى اخوتنا [ص. ١٢٠]
English translation
It was al-Ḥājj the heir and his mother was Mina Kaya. He was said to speak the language of the soothsayers, that he gave news from the Beyond and most of his sayings were in agreement with God's decrees. [An example] of that is that one day as he held court, surrounded by his officials, his courtiers, his intimates, and still others, while the flautists [zammārūn] played [yuzammirūn] before him. He remained silent for a long moment and then let out a profound sigh then said: Is now going to enter a man from our house, a son of our father and no one will enter before him and he is the most unhappy of our brothers
Folios/Pages
219
Date
1582 circa
Observations on the events description
The author refers to the player as "zammārūn" (plur.), from the same root of mizmār/mazāmīr, which is any single or double reed wind instrument and can be at times another name for the zurna.
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.