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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.
Reception in the camp outside Constantinople with musical instruments.
Text on source
ونزلنا على عشرة أميال من القسطنطينية، فلما كان بالغد خرج أهلها من رجال ونساء وصبيان ركبانًا ومشاة في أحسن زي وأجمل لباس وضربت عند الصبح الأطبال والأبواق والأنفار [ص. ٢٤٦]
English translation
We camped at a distance of ten miles from Constantinople, and on the following day its population, men, women and children, came out riding or on foot in their finest array and richest apparel. At dawn the drums [aṭbāl], coiled trumpets [abwāq] and straight trumpets [anfār] were sounded
Folios/Pages
504
Date
1333 circa
Observations on the events description
The usual list of three musical instruments is repeated in this passage, although the instruments are supposedly the same ones mentioned in the previous event (see Event 33 in this Travel).
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.