root node
The node at the top of a mesh hierarchy may be referred to as the root node.
Every other mesh resources in a mesh "lives under" the root node.
For pure mesh repos, the repository's name is used as root node's identifier.
For embedded mesh, the root node's folder name is its identifier.
A root node is not treated or represented any differently than any other mesh node, and it is not differentiated in metadata. So any node may become a root node simply by copying it somewhere that's not already a mesh.
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