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Examples of records with no parent are the records at the top of the tree such as the Series or Classification
Because no loops are allowed within the tree
A record cannot be a parent or child of itself
A record cannot be adopted by one of its (grand)children or (grand)parents
Inheritance
Metadata
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can be
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When a record is created or adopted under a parent record, the inheriting metadata fields will be copied from the parent to the child record
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flow through the record tree from top to bottom using Metadata Inheritance.