Please note that all relationships with this element, and all its children will be deleted as well.
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.
فرَكِبَ مركبًا منها وأنا معه وذلك في يوم السبت، فوصلنا عشي الإثنين إلى سندابور ودخلنا خورها، فوجدنا أهلها مستعدين للحرب، وقد نصبوا المجانيق، فبِتْنَا عليها تلك الليلة، فلما أصبح ضُرِبَت الطبول والأنفار والأبواق، وزحفت المراكب، ورمت عليها بالمجانيق [ص. ٤١١]
English translation
He [the Sultan] embarked on one of the vessels, I being with him, on a Saturday, and we reached Sandabur on the Monday evening. When we entered its bay, we found its inhabitants prepared for the battle, with mangonels already set up. So we spent that night near the place, and on the next morning, when the drums [ṭubūl], straight trumpets [anfār] and coiled trumpets [abwāq] were sounded, the vessels moved in to the attack, and the defenders bombarded them with the mangonels.
Folios/Pages
819-820
Date
1342 circa
Observations on the events description
The use of military bands during military operations is widely documented in the Islamic world, generally associated with the Nawba (see Ṭabl-K̲h̲āna, EI-2).
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.