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| | The Collection Description Frequency Namespace @en | |
| | Dublin Core Collection Description Task Group | |
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| | The event occurs once a year. @en | |
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| | The event occurs every two years. @en | |
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| | The event occurs every two months. @en | |
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| | The event occurs every two weeks. @en | |
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| | The event repeats without interruption. @en | |
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| | The event occurs once a day. @en | |
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