NMD
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A metadata object contains a number of categories, each containing multiple component which store the actual metadata. Here are the routines for manipulation the categories.
See NMDObjectTryGetCategory(), NMDObjectGetCategory(), NMDAllocateCategory(), NMDObjectAllocateNewCategory(), NMDObjectGetOrCreateCategory(), NMDRemoveCategory(), NMDGetCategories(), NMDCopyCategory().