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Early in the development process, the definition of a resource instance was extended to encompass embedded instances (EI). This change only affects the rules governing what statements belong in the instance's graph, although it has a profound effect on the behavior of the repository. Embedded instances are essentially regular resource instances which are considered part of a "parent" resource instance. The precise definition of an embedded instance is as follows:

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There is a separate ontology document describing the repository's internal data model and administrative metadata, refer to repository-internal.n3 for more information. Note that some statements described by that ontology appear as publicly-readable metadata statements, while others are private and never exposed outside of the repository codebase.

The "ontology" graph is considered read-only in normal operation. All internal metadata, (i.e. administrative metadata) is stored in a separate, distinct, named graph which should only be available to the repository's internal operations.

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