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 dire conditions in which he, his father, and a crew officer find themselves at Wet Jacket Arm suddenly hit by a storm during the night. The sounds of the storm were frightening.
Text on source
But about two o'clock we were roused by a loud thunder-clap. The storm was now at its height, and blew a perfect hurricane. The roar of the waves at a distance was tremendous, and only overcome at times by the agitation of the forests, and the crashing fall of huge timber-trees around us. We went to look after our boat and at that instant a dreadful flash illuminated the whole arm of the sea; we saw the billows foaming, and furiously rolled above each other in livid mountains; in a word it seemed as if all nature was hastening to a general catastrophe. The lightning was instantaneously followed by the most astonishing explosion we had ever heard, reverberated from the broken rocks around us; and our hearts funk with apprehension left the ship might be destroyed by the tempest or its concomitant ætherial fires, and ourselves left to perish in an unfrequented part of the world. In this dismal situation we lingered out the night, which seemed the longest we had ever know.
English translation
Folios/Pages
pp. 184-185
Date
1773 05 07
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.