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 what he heard from his father (Johann Reinhold) and from Captain Cook as they left the bay where the crew had camped for the night to stock up on supplies. As soon as the two had shot a duck, they heard screams coming from the other side of the river.
Text on source
The moment they had fired they heard a hideous shout of several loud and piercing voices round about them from different quarters. They shouted in their turn, and taking up the duck retired towards the boat, which was full half a mile off. The natives continued their clamours, but did not follow them; for indeed a deep branch of a river was between them, and their numbers were too inconsiderable to attempt hostilities; but these circumstances we only learnt in the sequel. We had in the mean while taken a ramble into the woods in search of plants; but hearing the shout of the natives, we embarked immediately in the remaining boat and joined the other, which by this time had taken Captain Cook and my father on board.
English translation
Folios/Pages
pp. 166-167
Date
1773 04 20 circa
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.