What is a Trie Key? - Trie key (Tree Key) is Used on a data layout (schema) to identify the position of a field within the layout. So if you have a data layout with a root element of order underneath you may have order number, customer name etc. The trie key would be the object . notation - this is an optional field that allows you to specify the part of the data layout that holds the collection of items. If you do not use the Trie Key it then DSYNC will assume the data layout you have is the collection. For more information please visit our DSYNC developer section.