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.
Georg Forster describes the hissing sound associated with seeing this meteor.
Text on source
At half past seven o'clock we saw a ball of fire to the northward, in size and splendor resembling the sun, though somewhat paler. It burst a few moments after, and left behind it several bright sparks, of which the largest, of an oblong shape, moved quickly out of our horizon, whilst a kind of bluish flame followed, and marked its course. Some heard a hissing noise, which accompanied the swift descent of this meteor.
English translation
Folios/Pages
pp. 440-441
Date
1774 09 30
Observations on the events description
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.