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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.
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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.
The sound of gunfire is heard from what is perceived as a great distance.
Text on source
ثمّ انّ الباشا محمود جهز جيشه فتبع اسكيا نوح الى ارض دنِدِ فوصل معه موصلًا في ذلك حتّى انّ اهل الارض كَنْتَ يسمع اصوات مدافعهم للمقاتلة بينهم في يوم واحد [ص. ١٥٣]
English translation
Pasha Maḥmūd made ready an army and pursued Askia Nūḥ to the land of Dendi. He went so far that the people of the land of the
Kanta [of Kebbi] heard their gunfire as they fought one day
Folios/Pages
203
Date
1592
Observations on the events description
This event description highlights once again how unusual gunfire sounded to the people of Songhay at the time.
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.