Glossary:Root node

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root node
root is a branch in the Contents window that keeps all elements of a given concept group. For example, a node named Chemistry might be a root node of all elements related to chemistry.
The root node determines how deep SuperMemo can interfere into the structure of the tree when working with a concept group. All elements under the root are subject to restructuring. All elements above the root are protected from changes.
The root is a node that keeps the hook that parents all newly added elements in the concept group.
The root of the whole collection is the root of the knowledge tree. This master root has a physical position of 1 in the collection (Element #1)