Dgraph uses head and tail to refer to respectively, the nodes an edge points from and to. This is in opposition to standard terminology where the head of an edge is the head of the arrow -- i.e. the to vertex -- and the tail of the arrow is the vertex the edge points from.
Given the mix-up over terminology, it might be better to replace current usage with unambiguous terms like from and to, noting their correspondence to other graph-theoretic terms in documentation.
Dgraph uses
headandtailto refer to respectively, the nodes an edge pointsfromandto. This is in opposition to standard terminology where theheadof an edge is the head of the arrow -- i.e. thetovertex -- and thetailof the arrow is the vertex the edge pointsfrom.Source: https://en.wikipedia.org/wiki/Graph_(mathematics)#Directed_graph
Given the mix-up over terminology, it might be better to replace current usage with unambiguous terms like
fromandto, noting their correspondence to other graph-theoretic terms in documentation.