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Which of the following statements is true?
| a. |
An anonymous node is the same as a blank node. |
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| b. |
Every IRI is also a URI. |
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| c. |
Blank nodes can never be used outside the RDF document in which they were originally defined. |
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| d. |
An RDF document can refer to identifiers defined in only one namespace. |
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| e. |
An RDF dataset must contain exactly one dataset. |
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