Along with level, this field allows you to identify the position of the node in the hierarchy of nodes. The root node always has level -1 and index -1. The indexing of nodes on each nested level starts anew from 0.
level
The level that the current node occupies in the hierarchy of nodes.
Along with index, this field allows you to identify the position of the node in the hierarchy of nodes. For example, the root node always has level -1 and index -1. Its children have level 0, the children's children have level 1, and so forth.
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