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.
During one of their scientific excursions, Georg Forster and his fellow get into trouble. Their guide alerts a group of locals at the bottom of the valley, who come to their aid.
Text on source
When we were about half-way down, he hallooed very loud to some people whom he saw in the valley; but we did not believe at that time that they had heard him, especially because he received no answer. However, presently after we observed several people coming up towards us, who ascended very fast, so as to meet us in about half an hour.
English translation
Folios/Pages
p. 351
Date
1773 08 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.