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 reports the variety of petrels' sounds heard by his father, Johann Reinold, and Captain Cook, at Anchor Island.
Text on source
They now heard a great variety of confused sounds coming from the sides of the hill, some very acute, others like the croaking of frogs, which were made by these petrels. At other times we have found innumerable holes on the top of one of the Seal Islands, and heard the young petrels making a noise in them; but as the holes communicated with each other it was impossible to come at one of them.
English translation
Folios/Pages
p. 153
Date
1773 04 13
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.