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 eruption of the volcano.
Text on source
We saw the flame of the volcano in the evening, blazing up, with an explosion once in five minutes or thereabouts. The transactions of the day prevented my speaking of this wonderful phaenomenon, though it was in continual agitation. Some of the explosions resembled very violent claps of thunder, and a rumbling noise continued for half a minute together.
English translation
Folios/Pages
pp. 267-268
Date
1774 08 05
Observations on the events description
The description of the event refers to the night of that day.
The dots on the map indicate the places where sound and music events were described. They don't represent travel stages.